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Leases (Details 2) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Assets that are financed with capital lease obligations    
Less: allowance for depreciation $ (0.1) $ (2.5)
Railcars [Member]    
Assets that are financed with capital lease obligations    
Capital leased assets, gross $ 9.0 $ 19.3