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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Changes in unrealized gains/(losses) on derivative instruments, tax $ 0 $ 0 $ 0.3
Amortization of prior service credit, tax 0.3 0.3 0.4
Amortization of actuarial net losses, tax (1.4) (0.8) (0.7)
Actuarial net (losses)/gains, tax $ 1.8 $ 17.8 $ (6.6)