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Goodwill and Other Intangible Assets - Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gross Amount      
Other intangible assets, beginning $ 618.7 $ 645.7  
Finite-Lived Intangible Assets, Disposal of Intangible Assets (13.4) (25.8)  
Currency translation effect on foreign balances (0.9) (1.2)  
Other intangible assets, ending 604.4 618.7 $ 645.7
Accumulated Amortization      
Other intangible assets, beginning (74.8) (72.6)  
Amortization of Intangible Assets, Adjustment for Disposal 13.4 20.7  
Amortization expense (18.8) (22.9) (24.4)
Currency translation effect on foreign balances 0.2 0.0  
Other intangible assets, ending $ (80.0) $ (74.8) $ (72.6)