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Leases - Future Minimum Lease Payments for Lease Obligations (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Capital Leased Assets [Line Items]  
Future minimum lease payments, Total $ 61.9
Future minimum lease payments, 2019 4.6
Future minimum lease payments, 2020 4.6
Future minimum lease payments, 2021 4.6
Future minimum lease payments, 2022 4.6
Future minimum lease payments, 2023 4.6
Future minimum lease payments, Remainder 38.9
Port Neches Storage Tanks  
Capital Leased Assets [Line Items]  
Capital lease for Port Neches storage tanks, Total 56.6
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, 2023 4.3
Capital lease for Port Neches storage tanks, Remainder 35.1
Capital lease for Port Neches storage tanks, interest 30.1
Capital lease for Port Neches storage tanks, principal 24.3
Capital lease for Port Neches storage tanks, executory costs 9.6
Operating lease of land  
Capital Leased Assets [Line Items]  
Operating lease for land, Total 3.4
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, 2023 0.2
Operating lease for land, Remainder 2.4
Lease of platform space and tie-in  
Capital Leased Assets [Line Items]  
Operating lease for land, Total 1.9
Operating lease for land, 2019 0.1
Operating lease for land, 2020 0.1
Operating lease for land, 2021 0.1
Operating lease for land, 2022 0.1
Operating lease for land, 2023 0.1
Operating lease for land, Remainder $ 1.4