Long-Term Debt - Capital Lease Obligations (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) lease
Capital Leased Assets [Line Items]
Number of leases acquired \| lease	2
Capital Lease related to Excel Pipeline LLC
Capital Leased Assets [Line Items]
Remaining term of leases	142 months
Capital Lease related to Magellan Pipeline Terminals, L.P.
Capital Leased Assets [Line Items]
Remaining term of leases	141 months
Capital Lease Obligations
Capital Leased Assets [Line Items]
Capital lease obligations	$ 45.0
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	6.5
2019	6.5
2020	6.5
2021	6.5
2022	6.5
Thereafter	44.2
Total future payments	76.7
Less: amount representing interest	31.7
Present value of future minimum payments	45.0
Less: current portion	2.1
Long-term portion	$ 42.9

Represents the remaining term of the lease.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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