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Investments in Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates $ 414.9 $ 392.9 $ 424.1
Equity in net earnings of affiliates 47.5 57.1 52.9
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 7,448.0 7,491.2  
Total liabilities 6,670.8 6,757.8  
Partners’ equity 777.2 733.4  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Revenues 297.4 313.0 383.4
Costs 159.0 158.1 234.7
Income before income taxes 138.4 154.9 148.7
Receivables from affiliates 54.4 70.1 108.4
Undistributed earnings 312.6 296.8  
Finance joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 380.8 359.4  
Equity in net earnings of affiliates 45.5 53.8 48.8
Manufacturing joint ventures      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 17.8 18.1  
Other affiliates      
Schedule of Equity Method Investments [Line Items]      
Investment in affiliates 16.3 15.4  
Manufacturing and other joint ventures      
Schedule of Equity Method Investments [Line Items]      
Equity in net earnings of affiliates $ 2.0 $ 3.3 $ 4.1