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Investments in Affiliates (Summarized Financial Information of Finance Joint Ventures) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Total assets $ 11,421.2 $ 10,103.7 $ 9,182.1
Total liabilities 6,764.4 6,221.1  
Partners’ equity 4,656.7 3,882.4  
Income before income taxes 211.9 179.7 183.0
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Schedule of Equity Method Investments [Line Items]      
Total assets 10,035.8 8,359.1  
Total liabilities 9,088.3 7,562.8  
Partners’ equity 947.5 796.3  
Revenues 680.5 454.6 411.1
Costs $ 468.6 $ 274.9 $ 228.1