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Leases - Future Minimum Lease Payments for Lease Obligations (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Capital Leased Assets [Line Items]  
Future minimum lease payments, Total $ 68.3
Future minimum lease payments, 2018 4.7
Future minimum lease payments, 2019 4.7
Future minimum lease payments, 2020 4.8
Future minimum lease payments, 2021 4.8
Future minimum lease payments, 2022 4.8
Future minimum lease payments, Remainder 44.5
Port Neches Storage Tanks  
Capital Leased Assets [Line Items]  
Capital lease for Port Neches storage tanks, Total 58.7
Capital lease for Port Neches storage tanks, 2018 4.3
Capital lease for Port Neches storage tanks, 2019 4.3
Capital lease for Port Neches storage tanks, 2020 4.3
Capital lease for Port Neches storage tanks, 2021 4.3
Capital lease for Port Neches storage tanks, 2022 4.3
Capital lease for Port Neches storage tanks, Remainder 37.2
Capital lease for Port Neches storage tanks, interest 33.4
Capital lease for Port Neches storage tanks, principal 24.9
Capital lease for Port Neches storage tanks, executory costs 10.3
Operating lease of land  
Capital Leased Assets [Line Items]  
Operating lease for land, Total 2.7
Operating lease for land, 2018 0.2
Operating lease for land, 2019 0.2
Operating lease for land, 2020 0.2
Operating lease for land, 2021 0.2
Operating lease for land, 2022 0.2
Operating lease for land, Remainder 1.7
Lease of platform space and tie-in  
Capital Leased Assets [Line Items]  
Operating lease for land, Total 6.9
Operating lease for land, 2018 0.2
Operating lease for land, 2019 0.2
Operating lease for land, 2020 0.3
Operating lease for land, 2021 0.3
Operating lease for land, 2022 0.3
Operating lease for land, Remainder $ 5.6