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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning $ 1,011.7 $ 778.0 $ 976.9 $ 742.0
Other comprehensive income before reclassification     (5.0)  
Amounts reclassified from accumulated other comprehensive income     0.3  
Total other comprehensive income (6.6) 3.5 (4.7) 6.3
Balance, ending 1,065.3 835.4 1,065.3 835.4
Pension and Other Post-Employment Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning     (12.3)  
Other comprehensive income before reclassification     (0.7)  
Amounts reclassified from accumulated other comprehensive income     0.3  
Total other comprehensive income     (0.4)  
Balance, ending (12.7)   (12.7)  
Foreign Currency Items        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning     (87.9)  
Other comprehensive income before reclassification     (4.3)  
Amounts reclassified from accumulated other comprehensive income     0.0  
Total other comprehensive income     (4.3)  
Balance, ending (92.2)   (92.2)  
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning (98.3) (104.2) (100.2) (107.0)
Balance, ending $ (104.9) $ (100.7) $ (104.9) $ (100.7)