Annual report pursuant to Section 13 and 15(d)

PENSIONS AND POSTRETIREMENT BENEFITS (Effect of Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Pension Plan Assets) (Details)

v3.3.1.900
PENSIONS AND POSTRETIREMENT BENEFITS (Effect of Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Pension Plan Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
The following represents the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets for the years ended December 31, 2015 and 2014:
 
(In Millions)
 
Year Ended December 31, 2015
 
Hedge Funds
 
Private Equity
Funds
 
Structured
Credit Fund
 
Real
Estate
 
Total
Beginning balance — January 1, 2015
$
41.5

 
$
31.2

 
$
65.4

 
$
50.0

 
$
188.1

Actual return on plan assets:

 

 

 

 
 
Relating to assets still held at
    the reporting date
(0.8
)
 
1.5

 
(3.3
)
 
8.1

 
5.5

Relating to assets sold during
    the period
—

 
2.5

 
—

 
—

 
2.5

Purchases
—

 
5.7

 
—

 
—

 
5.7

Sales
—

 
(7.8
)
 
—

 
(0.6
)
 
(8.4
)
Ending balance — December 31, 2015
$
40.7

 
$
33.1

 
$
62.1

 
$
57.5

 
$
193.4

 
(In Millions)
 
Year Ended December 31, 2014
 
Hedge Funds
 
Private Equity
Funds
 
Structured
Credit Fund
 
Real
Estate
 
Total
Beginning balance — January 1, 2014
$
38.8

 
$
29.1

 
$
61.0

 
$
40.9

 
$
169.8

Actual return on plan assets:

 

 

 

 
 
Relating to assets still held at
    the reporting date
2.7

 
3.2

 
4.4

 
5.2

 
15.5

Relating to assets sold during
    the period
—

 
3.0

 
—

 
—

 
3.0

Purchases
—

 
1.4

 
—

 
5.4

 
6.8

Sales
—

 
(5.5
)
 
—

 
(1.5
)
 
(7.0
)
Ending balance — December 31, 2014
$
41.5

 
$
31.2

 
$
65.4

 
$
50.0

 
$
188.1

 
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year $ 188.1 $ 169.8
Actual return on plan assets:    
Relating to assets still held at the reporting date 5.5 15.5
Relating to assets sold during the period 2.5 3.0
Purchases 5.7 6.8
Sales (8.4) (7.0)
Fair value of plan assets — end of year 193.4 188.1
Hedge Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 41.5 38.8
Actual return on plan assets:    
Relating to assets still held at the reporting date (0.8) 2.7
Relating to assets sold during the period 0.0 0.0
Purchases 0.0 0.0
Sales 0.0 0.0
Fair value of plan assets — end of year 40.7 41.5
Private Equity Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 31.2 29.1
Actual return on plan assets:    
Relating to assets still held at the reporting date 1.5 3.2
Relating to assets sold during the period 2.5 3.0
Purchases 5.7 1.4
Sales (7.8) (5.5)
Fair value of plan assets — end of year 33.1 31.2
Structured Finance [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 65.4 61.0
Actual return on plan assets:    
Relating to assets still held at the reporting date (3.3) 4.4
Relating to assets sold during the period 0.0 0.0
Purchases 0.0 0.0
Sales 0.0 0.0
Fair value of plan assets — end of year 62.1 65.4
Real Estate [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 50.0 40.9
Actual return on plan assets:    
Relating to assets still held at the reporting date 8.1 5.2
Relating to assets sold during the period 0.0 0.0
Purchases 0.0 5.4
Sales (0.6) (1.5)
Fair value of plan assets — end of year $ 57.5 $ 50.0
Veba Trust [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
The following represents the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets for the year ended December 31, 2015 and 2014:
 
(In Millions)
 
Year Ended December 31, 2015
 
Hedge 
Funds
 
Private Equity
Funds
 
Structured Credit Fund
 
Real
Estate
 
Total
Beginning balance — January 1, 2015
$
11.5

 
$
6.2

 
$
6.1

 
$
8.7

 
$
32.5

Actual return on plan assets:

 

 

 

 
 
Relating to assets still held at the reporting date
(0.3
)
 
0.3

 
(0.3
)
 
1.3

 
1.0

Relating to assets sold during the period
—

 
0.4

 
—

 
—

 
0.4

Purchases
—

 
0.1

 
—

 
—

 
0.1

Sales
—

 
(1.5
)
 
—

 
—

 
(1.5
)
Ending balance — December 31, 2015
$
11.2

 
$
5.5

 
$
5.8

 
$
10.0

 
$
32.5

 
(In Millions)
 
Year Ended December 31, 2014
 
Hedge 
Funds
 
Private Equity
Funds
 
Structured Credit Fund
 
Real
Estate
 
Total
Beginning balance — January 1, 2014
$
24.6

 
$
6.0

 
$
13.5

 
$
13.2

 
$
57.3

Actual return on plan assets:

 

 

 

 
 
Relating to assets still held at the reporting date
0.5

 
1.0

 
0.4

 
0.9

 
2.8

Relating to assets sold during the period
0.6

 
0.4

 
0.4

 
0.5

 
1.9

Purchases
—

 
0.1

 
—

 
—

 
0.1

Sales
(14.2
)
 
(1.3
)
 
(8.2
)
 
(5.9
)
 
(29.6
)
Ending balance — December 31, 2014
$
11.5

 
$
6.2

 
$
6.1

 
$
8.7

 
$
32.5