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Assets Held for Sale Asset Held For Sale (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items]          
Portfolio Proceeds     $ 131.0 $ 170.6  
Disposition Gains on Owned Assets $ 7.6 $ 11.6 41.4 36.7  
Asset Impairment Charges     1.9 1.8  
Assets Held-for-sale, Long Lived, Fair Value Disclosure 23.6   23.6   $ 89.5
Portfolio Management [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Disposition Gains on Owned Assets 0.0 (0.3) 1.8 4.2  
Asset Impairment Charges     0.0 (1.8)  
Assets Held-for-sale, Long Lived, Fair Value Disclosure 19.2   19.2   45.6
Rail North America [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Disposition Gains on Owned Assets 7.5 $ 11.9 39.5 32.5  
Asset Impairment Charges     1.9 $ 0.0  
Assets Held-for-sale, Long Lived, Fair Value Disclosure $ 4.4   $ 4.4   $ 43.9
Marine vessels [Member] | Portfolio Management [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Property, Plant and Equipment, Dispositions     26.4    
Portfolio Proceeds     $ 28.2    
Railcars [Member] | Rail North America [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Property, Plant and Equipment, Dispositions     21.8    
Portfolio Proceeds     $ 49.9    
Property, Plant and Equipment, Transfers and Changes     19.7    
Railcars [Member]          
Long Lived Assets Held-for-sale [Line Items]          
Disposition Gains on Owned Assets     $ 28.1