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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 28.7 $ 112.2 $ 85.0
Changes in cumulative translation adjustment, net of tax of $3.9 million, $(0.3) million and $2.7 million, respectively 23.7 (6.0) (22.6)
Changes in derivative instruments, net of tax of $0.0 million, $(0.4) million and $(0.1) million, respectively 0.0 (1.5) 0.3
Amortization of prior service credit, net of tax of $0.1 million, $0.2 million and $0.2 million, respectively (0.4) (0.7) (0.9)
Amortization of actuarial net losses, net of tax of $(0.2) million, $0.0 million and $(0.3) million, respectively 1.5 (0.0) 1.7
Actuarial net (losses)/gains arising during the year, net of tax of $1.9 million, $(2.2) million and $3.3 million, respectively (7.7) 9.5 (15.7)
Total comprehensive income $ 45.8 $ 113.5 $ 47.8