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Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Consolidated Statements of Comprehensive Income [Abstract]    
Changes in unrealized gains/(losses) on derivative instruments, tax $ 0 $ 0.1
Amortization of prior service credit, tax 0.1 0.1
Amortization of actuarial net losses, tax $ (0.4) $ (0.1)