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Railcar Leasing and Management Services Group - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Assets $ 9,477.0 [1] $ 9,543.2
Property, plant, and equipment, net 6,393.5 [1] $ 6,134.7
Railcar Leasing and Management Services Group | Property lease guarantee    
Segment Reporting Information [Line Items]    
Operating lease obligations guaranteed $ 4.8  
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  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group    
Segment Reporting Information [Line Items]    
Net book value of unpledged equipment $ 2,627.8  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Capital lease obligations    
Segment Reporting Information [Line Items]    
Collateral securing debt 40.4  
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Non-recourse debt    
Segment Reporting Information [Line Items]    
Collateral securing debt 1,735.5  
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 1,273.4  
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 549.4  
Wholly-Owned Qualified Subsidiaries for Leasing Railcars from Trusts [Member] | Railcar Leasing and Management Services Group    
Segment Reporting Information [Line Items]    
Assets 138.0  
Cash 48.0  
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 $ 62.9  
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)