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Consolidated Statement of Comprehensive Income Parentheticals (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statement of Comprehensive Income      
Defined pension and postretirement pension plans, tax $ 1.1 $ 1.7 $ 0.5
Net changes in unrealized loss on derivative instruments, tax $ 1.0 $ 0.1 $ 0.9