Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Income Taxes for Other than Continuing Operations) (Details)

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INCOME TAXES INCOME TAXES (Income Taxes for Other than Continuing Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]      
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax $ 0.0 $ 37.1 $ 83.2
Other Comprehensive Income Unrealized Gain Loss On Mark To Market Adjustments Arising During Period Tax 0.3 3.6 1.8
Other Comprehensive Income (Loss), Other Tax 5.9 0.2 (9.8)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 6.2 40.9 75.2
Income Tax Effects Allocated Directly to Equity, Equity Transactions 0.0 (4.8) 3.5
Discontinued Operation, Tax Effect of Discontinued Operation $ (6.0) $ (1,216.0) $ (184.5)