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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other comprehensive income:      
Tax benefit, Pension and postretirement liability adjustments $ 0.8 $ 3.9 $ 1.0
Tax benefit, Change in fair value of cash flow hedges 0 0.1 0.1
Tax benefit, Reclassification adjustment for hedge gains and losses included in net income (loss) $ 0 $ 0.2 $ 0.1