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Railcar Leasing and Management Services Group (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Assets $ 9,143.4 [1] $ 9,125.3
Property, plant, and equipment, net 6,080.1 [1] $ 5,966.8
Railcar Leasing and Management Services Group | Property lease guarantee    
Segment Reporting Information [Line Items]    
Operating lease obligations guaranteed 8.3  
Railcar Leasing and Management Services Group | Wholly-owned subsidiaries    
Segment Reporting Information [Line Items]    
Net book value of unpledged equipment 2,633.9  
Railcar Leasing and Management Services Group | Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member]    
Segment Reporting Information [Line Items]    
Assets 145.1  
Cash 53.6  
Railcar Leasing and Management Services Group | Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railroad Transportation Equipment    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 63.6  
Railcar Leasing and Management Services Group | Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railroad transportation equipment leased from independent owner trusts    
Segment Reporting Information [Line Items]    
Period of railcars leased from the Trusts under operating leases (in years) 22 years  
Railcar Leasing and Management Services Group | Capital lease obligations | Wholly-owned subsidiaries    
Segment Reporting Information [Line Items]    
Collateral securing debt $ 41.9  
Railcar Leasing and Management Services Group | Non-recourse debt | Wholly-owned subsidiaries    
Segment Reporting Information [Line Items]    
Collateral securing debt 1,379.8  
Railcar Leasing and Management Services Group | Non-recourse debt | TRIP Holdings | TRIP Master Funding secured railcar equipment notes    
Segment Reporting Information [Line Items]    
Collateral securing debt 1,300.1  
Railcar Leasing and Management Services Group | Non-recourse debt | TRL 2012 | TRL 2012 secured railcar equipment notes    
Segment Reporting Information [Line Items]    
Collateral securing debt $ 563.8  
Railcar Leasing and Management Services Group | Minimum    
Segment Reporting Information [Line Items]    
Term of leases with third parties (in years) 1 year  
Railcar Leasing and Management Services Group | Maximum    
Segment Reporting Information [Line Items]    
Term of leases with third parties (in years) 20 years  
[1] (unaudited)