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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Changes in unrealized gains/(losses) on derivative instruments, tax $ 0 $ 0 $ 0 $ 0
Amortization of prior service credit, tax 0.1 0.1 0.2 0.2
Amortization of actuarial net losses, tax $ (0.2) $ (0.3) $ (0.8) $ (1.0)