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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 23.3 $ 11.4 $ 66.6 $ 59.2
Other comprehensive income:        
Changes in cumulative translation adjustment, net of tax of $(0.4) million, $0.1 million, $(1.3) million and $(0.7) million, respectively 18.1 (0.1) 30.7 (0.3)
Changes in unrealized gains on derivative instruments, net of tax of $0.0 million, $0.0 million, $0.0 million and $0.0 million, respectively 0.2 0.0 0.2 0.0
Amortization of prior service credit, net of tax of $0.0 million, $0.0 million, $0.1 million and $0.1 million, respectively (0.2) (0.2) (0.6) (0.7)
Amortization of actuarial net losses, net of tax of $(0.1) million, $(0.1) million, $(0.6) million and $(0.4) million, respectively 1.1 0.5 3.1 1.6
Total other comprehensive income 19.2 0.2 33.4 0.6
Total comprehensive income $ 42.5 $ 11.6 $ 100.0 $ 59.8