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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity $ 209.1 $ 167.1 $ 174.4 $ 184.3
Cumulative translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity (52.5) (51.7)    
Pension plans actuarial loss, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity (82.5) (114.1)    
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity $ (135.0) $ (165.8) $ (149.6) $ (146.6)