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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net income $ 17.2 $ 18.9
Other comprehensive income:    
Changes in cumulative translation adjustment, net of tax of $(0.1) million and $0.4 million, respectively 3.5 1.6
Changes in unrealized gains on derivative instruments, net of tax of $(0.1) million and $0.0 million, respectively 0.2 0.0
Amortization of prior service credit, net of tax of $0.1 million and $0.1 million, respectively (0.2) (0.2)
Amortization of actuarial net losses, net of tax of $(0.2) million and $(0.2) million, respectively 1.0 0.5
Total other comprehensive income 4.5 1.9
Total comprehensive income $ 21.7 $ 20.8