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Goodwill and Identifiable Assets Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2024 $ 58.1  
2025 48.8  
2026 41.8  
2027 32.0  
2028 21.2  
Thereafter 23.2  
Net Carrying Amount $ 225.1 $ 296.8