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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 26.1 $ 28.9 $ 43.3 $ 47.8
Other comprehensive income:        
Changes in cumulative translation adjustment, net of tax of $(0.7) million, $(1.2) million, $(0.8) million and $(0.8) million, respectively 9.1 (1.8) 12.6 (0.2)
Changes in unrealized gains on derivative instruments, net of tax of $0.1 million, $0.0 million, $0.0 million and $0.0 million, respectively (0.2) 0.0 0.0 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) (0.3) (0.4) (0.5)
Amortization of actuarial net losses, net of tax of $(0.3) million, $(0.1) million, $(0.5) million and $(0.3) million, respectively 1.0 0.6 2.0 1.1
Total other comprehensive income/(loss) 9.7 (1.5) 14.2 0.4
Total comprehensive income $ 35.8 $ 27.4 $ 57.5 $ 48.2