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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 81.3 $ 119.5 $ 84.1
Changes in cumulative translation adjustment, net of tax of $1.5 million, $(0.2) million and $1.5 million, respectively (20.5) (11.0) (18.0)
Unrealized gains on derivative instruments, net of tax of $(0.1) million, $0.0 million and $0.0 million, respectively 0.3 0.0 0.0
Amortization of prior service credit, net of tax of $0.2 million, $0.2 million and $0.3 million, respectively (0.9) (1.0) (1.0)
Amortization of actuarial net losses, net of tax of $(0.5) million, $(1.0) million and $(1.1) million, respectively 2.1 4.2 4.3
Actuarial net gains arising during the year, net of tax of $(0.8) million, $(0.9) million and $(13.9) million, respectively 3.7 3.2 54.7
Total comprehensive income $ 66.0 $ 114.9 $ 124.1