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Investments in Affiliates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Noncontrolling interest, ownership percentage by parent 49.00%    
Investment in affiliates $ 380.2 $ 400.0  
Equity in net earnings of affiliates 42.5 34.3 $ 39.1
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 7,773.2 7,649.2  
Total liabilities 7,082.4 6,917.2  
Partners’ equity 690.8 732.0  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Revenues 417.6 390.8 366.0
Costs 299.9 286.7 243.3
Income before income taxes 117.7 104.1 122.7
Receivables from affiliates 15.2 12.9  
Undistributed earnings 310.8 326.9  
Finance joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 339.0 358.7  
Equity in net earnings of affiliates 41.5 34.7 39.9
Manufacturing joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 26.8 26.3  
Other affiliates      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 14.4 15.0  
Manufacturing and other joint ventures      
Schedule of Equity Method Investments [Line Items]      
Equity in net earnings of affiliates $ 1.0 $ (0.4) $ (0.8)