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Other Comprehensive (Loss) Earnings - Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Foreign currency translation:      
Foreign currency translation, before tax $ (3.6) $ 13.8 $ 1.3
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent 0.0 0.0 0.0
Foreign currency translation, net of tax (3.6) 13.8 1.3
Employee benefit plans:      
Employee benefit plans, before Tax 6.6 (4.4) (3.2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent (1.6) 1.0 0.0
Net change in employee benefit plans 5.0 (3.4) (3.2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax (1.6) 1.4 1.1
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (1.3) 0.7 (0.2)
Changes in fair value of cash flow hedges:      
Change in fair value of cash flow hedges, tax 0.3 (0.3) (0.2)
Total cash flow hedges (1.3) 1.1 0.9
Total:      
Other Comprehensive Income (Loss), before tax 1.4 10.8 (0.8)
Other comprehensive earnings (loss), net of tax $ 0.1 $ 11.5 $ (1.0)