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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Carrying Amount $ 242.9 $ 296.8
Remainder of 2023 17.9  
2023 58.1  
2024 48.8  
2025 41.8  
2026 32.0  
Thereafter $ 44.3