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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Carrying Amount $ 210.0 $ 225.1
Remainder of 2024 43.0  
2025 48.8  
2026 41.8  
2027 32.0  
2028 21.2  
Thereafter $ 23.2