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Investments in Affiliates (Investment in Affiliates) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates $ 512.7 $ 436.9
Finance joint ventures    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates 464.3 390.2
Manufacturing joint ventures    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates 30.6 29.9
Other affiliates    
Schedule of Equity Method Investments [Line Items]    
Investments in affiliates $ 17.8 $ 16.8