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Consolidated Statement of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Changes in unrealized gains/(losses) on derivative instruments, tax $ 0 $ 0 $ 0 $ 0.1
Amortization of prior service credit, tax 0 0.1 0.1 0.2
Amortization of actuarial net losses, tax $ (0.3) $ (0.1) $ (0.7) $ (0.2)