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)

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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, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year $ 192.2 $ 186.0
Actual return on plan assets:    
Relating to assets still held at the reporting date 21.8 7.0
Relating to assets sold during the period (0.8) 4.0
Purchases 14.4 40.2
Sales (27.1) (45.0)
Fair value of plan assets — end of year 200.5 192.2
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 100.7 105.8
Actual return on plan assets:    
Relating to assets still held at the reporting date 4.2 (2.4)
Relating to assets sold during the period (0.3) 0.5
Purchases 0 35.8
Sales (19.0) (39.0)
Fair value of plan assets — end of year 85.6 100.7
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 30.1 25.0
Actual return on plan assets:    
Relating to assets still held at the reporting date 1.4 2.6
Relating to assets sold during the period 0 3.0
Purchases 2.2 4.4
Sales (4.4) (4.9)
Fair value of plan assets — end of year 29.3 30.1
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 44.9 39.7
Actual return on plan assets:    
Relating to assets still held at the reporting date 11.3 5.2
Relating to assets sold during the period 0 0
Purchases 0 0
Sales 0 0
Fair value of plan assets — end of year 56.2 44.9
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 16.5 15.5
Actual return on plan assets:    
Relating to assets still held at the reporting date 4.9 1.6
Relating to assets sold during the period (0.5) 0.5
Purchases 12.2 0
Sales (3.7) (1.1)
Fair value of plan assets — end of year $ 29.4 $ 16.5