Long-Term Debt (Details 9) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Long-term portion	48.5	$ 49.9
Capital Lease related to Excel Pipeline LLC
Capital Leased Assets [Line Items]
Remaining term of leases	178 months
Capital Lease related to Magellan Pipeline Terminals, L.P.
Capital Leased Assets [Line Items]
Remaining term of leases	177 months
Capital lease
Capital Leased Assets [Line Items]
Outstanding obligation	49.9
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	6.4
2016	6.4
2017	6.4
2018	6.5
2019	6.5
2020 and thereafter	63.7
Total future payments	95.9
Less: amount representing interest	46.0
Present value of future minimum payments	49.9
Less: current portion	1.4
Long-term portion	48.5

Represents the remaining term of the lease.

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

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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 and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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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 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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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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