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Condensed Consolidated Statement of Comprehensive Income (parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statement of Comprehensive Income (parenthetical) [Abstract]    
Adjustment to pension and other benefit plans tax impact $ 1.2 $ 1.5
Unrealized gain or loss on investment tax impact 0 (0.1)
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax $ 0.2 $ (0.1)