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Leases (Details 2) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Assets that are financed with capital lease obligations    
Less: allowance for depreciation $ (79.8) $ (75.3)
Capital leased assets, net 22.5 7.8
Railcars [Member]    
Assets that are financed with capital lease obligations    
Capital leased assets, gross 17.8 0.0
Marine vessels [Member]    
Assets that are financed with capital lease obligations    
Capital leased assets, gross $ 84.5 $ 83.1