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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Amortization of prior service credit, tax $ 0.1 $ 0.1
Amortization of actuarial net losses, tax $ (0.2) $ (0.3)