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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Beginning balance $ 218.8 $ 233.9
Beginning balance, accumulated impairment losses (36.8) (40.8)
Beginning balance, net 182.0 193.1
Foreign currency fluctuations 1.9 (15.1)
Foreign currency fluctuations, accumulated impairment losses 3.5 4.0
Foreign currency fluctuations, net 5.4 (11.1)
Ending balance 220.7 218.8
Ending balance, accumulated impairment losses (33.3) (36.8)
Ending balance, net $ 187.4 $ 182.0