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Investments in Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates $ 409.0 $ 414.9  
Equity in net earnings of affiliates 39.1 47.5 $ 57.1
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 8,440.0 7,448.0  
Total liabilities 7,677.3 6,670.8  
Partners’ equity 762.7 777.2  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Revenues 305.7 297.4 313.0
Costs 183.0 159.0 158.1
Income before income taxes 122.7 138.4 154.9
Receivables from affiliates 23.4 54.4  
Undistributed earnings 321.9 312.6  
Finance joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 373.7 380.8  
Equity in net earnings of affiliates 39.9 45.5 53.8
Manufacturing joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 20.1 17.8  
Other affiliates      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 15.2 16.3  
Manufacturing and other joint ventures      
Schedule of Equity Method Investments [Line Items]      
Equity in net earnings of affiliates $ (0.8) $ 2.0 $ 3.3