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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity $ 174.4 $ 167.1 $ 184.3 $ 174.5
Cumulative translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity (55.5) (51.7)    
Reclassification out of AOCI 2.5      
Pension plans actuarial loss, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity (94.1) (114.1)    
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders' equity $ (149.6) $ (165.8) $ (146.6) $ (140.7)