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Investments in Affiliates (Summarized Financial Information of Finance Joint Ventures) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]      
Total assets $ 11,190.6 $ 11,421.2 $ 10,103.7
Total liabilities 7,147.7 6,764.4  
Partners’ equity 3,742.8 4,656.7  
Income before income taxes 119.0 211.9 179.7
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Schedule of Equity Method Investments [Line Items]      
Total assets 10,036.4 10,035.8  
Total liabilities 9,074.3 9,088.3  
Partners’ equity 962.1 947.5  
Revenues 791.7 680.5 454.6
Costs $ 672.7 $ 468.6 $ 274.9