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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]    
Defined benefit pension and other postretirement plan adjustments, tax $ 1.1 $ 0.6
Net losses on derivatives, tax $ (0.4) $ 0