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Railcar Leasing and Management Services Group - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Assets $ 9,564.9 [1] $ 9,125.3
Property, plant, and equipment, net 6,070.1 [1] $ 5,966.8
Railcar Leasing and Management Services Group | Property lease guarantee    
Segment Reporting Information [Line Items]    
Operating lease obligations guaranteed $ 6.5  
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  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group    
Segment Reporting Information [Line Items]    
Net book value of unpledged equipment $ 2,290.4  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Capital lease obligations    
Segment Reporting Information [Line Items]    
Collateral securing debt 41.1  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Non-recourse debt    
Segment Reporting Information [Line Items]    
Collateral securing debt 1,719.7  
TRIP Holdings | Railcar Leasing and Management Services Group | Non-recourse debt | TRIP Master Funding secured railcar equipment notes    
Segment Reporting Information [Line Items]    
Collateral securing debt 1,280.6  
TRL 2012 | Railcar Leasing and Management Services Group | Non-recourse debt | TRL 2012 secured railcar equipment notes    
Segment Reporting Information [Line Items]    
Collateral securing debt 555.9  
Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railcar Leasing and Management Services Group    
Segment Reporting Information [Line Items]    
Assets 144.5  
Cash 53.3  
Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railcar Leasing and Management Services Group | Railroad Transportation Equipment    
Segment Reporting Information [Line Items]    
Property, plant, and equipment, net $ 63.0  
Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railcar Leasing and Management Services Group | 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  
[1] (unaudited)