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Railcar Leasing and Management Services Group (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Assets $ 9,452.1 [1] $ 9,125.3
Property, plant, and equipment, net 6,073.2 [1] $ 5,966.8
Railcar Leasing and Management Services Group | Property lease guarantee    
Segment Reporting Information [Line Items]    
Operating lease obligations guaranteed 7.4  
Railcar Leasing and Management Services Group | Wholly-owned subsidiaries    
Segment Reporting Information [Line Items]    
Net book value of unpledged equipment 2,281.5  
Railcar Leasing and Management Services Group | Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member]    
Segment Reporting Information [Line Items]    
Assets 145.6  
Cash 54.1  
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 $ 63.7  
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 $ 41.4  
Railcar Leasing and Management Services Group | Non-recourse debt | Wholly-owned subsidiaries    
Segment Reporting Information [Line Items]    
Collateral securing debt 1,729.8  
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 1,290.1  
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 $ 560.0  
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)