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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Amortization of prior service credit, tax $ 0.0 $ 0.1 $ 0.1 $ 0.2
Amortization of actuarial net losses, tax $ (0.1) $ (0.2) $ (0.4) $ (0.8)