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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 85.0 $ 61.8 $ 81.3
Changes in cumulative translation adjustment, net of tax of $2.7 million, $(3.3) million and $1.5 million, respectively (22.6) 44.0 (20.5)
Unrealized gains on derivative instruments, net of tax of $(0.1) million, $(0.2) million and $(0.1) million, respectively 0.3 0.9 0.3
Amortization of prior service credit, net of tax of $0.2 million, $0.2 million and $0.2 million, respectively (0.9) (0.8) (0.9)
Amortization of actuarial net losses, net of tax of $(0.3) million, $(0.9) million and $(0.5) million, respectively 1.7 4.1 2.1
Actuarial net (losses)/gains arising during the year, net of tax of $3.3 million, $(8.8) million and $(0.8) million, respectively (15.7) 39.5 3.7
Total comprehensive income $ 47.8 $ 149.5 $ 66.0