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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 61.8 $ 81.3 $ 119.5
Changes in cumulative translation adjustment, net of tax of $(3.3) million, $1.5 million and $(0.2) million, respectively 44.0 (20.5) (11.0)
Unrealized gains on derivative instruments, net of tax of $(0.2) million, $(0.1) million and $0.0 million, respectively 0.9 0.3 0.0
Amortization of prior service credit, net of tax of $0.2 million, $0.2 million and $0.2 million, respectively (0.8) (0.9) (1.0)
Amortization of actuarial net losses, net of tax of $(0.9) million, $(0.5) million and $(1.0) million, respectively 4.1 2.1 4.2
Actuarial net gains arising during the year, net of tax of $(8.8) million, $(0.8) million and $(0.9) million, respectively 39.5 3.7 3.2
Total comprehensive income $ 149.5 $ 66.0 $ 114.9