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Condensed Consolidated Statement of Comprehensive Income (parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statement of Comprehensive Income (parenthetical) [Abstract]        
Adjustment to pension and other benefit plans tax impact $ 1.6 $ 0.7 $ 4.5 $ 2.2
Unrealized gain or loss on investment tax impact 0 0 0.1 0.2
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax $ 0.2 $ 0.5 $ 0.3 $ 0.5