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Investments in Affiliates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Noncontrolling interest, ownership percentage by parent 49.00%    
Investment in affiliates $ 400.0 $ 409.0  
Equity in net earnings of affiliates 34.3 39.1 $ 47.5
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 7,643.5 8,440.0  
Total liabilities 6,911.5 7,677.3  
Partners’ equity 732.0 762.7  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Revenues 305.2 305.7 297.4
Costs 201.1 183.0 159.0
Income before income taxes 104.1 122.7 138.4
Receivables from affiliates 12.9 23.4  
Undistributed earnings 326.9 321.9  
Finance joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 358.7 373.7  
Equity in net earnings of affiliates 34.7 39.9 45.5
Manufacturing joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 26.3 20.1  
Other affiliates      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 15.0 15.2  
Manufacturing and other joint ventures      
Schedule of Equity Method Investments [Line Items]      
Equity in net earnings of affiliates $ (0.4) $ (0.8) $ 2.0