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Goodwill and Other Intangibles - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Intangible Assets      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 9.3 $ 9.3 $ 14.8
Estimated future amortization expense for 2024 9.5    
Estimated future amortization expense for 2025 8.9    
Estimated future amortization expense for 2026 8.5    
Estimated future amortization expense for 2027 8.3    
Estimated future amortization expense for 2028 7.7    
Computer Software      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 509.4 $ 434.2 $ 390.1