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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Decrease (increase) in:
Accounts receivable - trade	$ 483.3	$ (163.5)
Accounts receivable - related parties	1.3	(0.2)
Inventories	65.7	84.1
Prepaid and other current assets	5.6	8.5
Other assets	23.5	2.1
Increase (decrease) in:
Accounts payable - trade	106.9	(32.8)
Accounts payable - related parties	(59.5)	(34.0)
Accrued product payables	(149.1)	261.7
Accrued interest	(132.2)	(115.2)
Other current liabilities	(9.6)	(0.2)
Other liabilities	6.6	(18.5)
Net effect of changes in operating accounts	342.5	(8.0)
Liability for construction in progress expenditures	182.4		205.3
Significant Acquisitions and Disposals [Line Items]
Proceeds from asset sales and insurance recoveries	96.3	130.5
Net gains (losses) attributable to asset sales and insurance recoveries	89.6	63.9
Seminole Pipeline segment [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from asset sales and insurance recoveries	0	86.9
Net gains (losses) attributable to asset sales and insurance recoveries	0	52.5
Chemical Trucking Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from asset sales and insurance recoveries	0	29.5
Net gains (losses) attributable to asset sales and insurance recoveries	0	(0.5)
West Storage Facilities [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from asset sales and insurance recoveries	95.0	8.8
Net gains (losses) attributable to asset sales and insurance recoveries	95.0	8.8
Other Disposal of Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from asset sales and insurance recoveries	1.3	5.3
Net gains (losses) attributable to asset sales and insurance recoveries	$ (5.4)	$ 3.1

X

- Definition

The net change during the reporting period in product expenses incurred but not yet paid. This element should be used when there is no other more specific or appropriate element.

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Future cash outflow to pay for construction in progress expenditures that have occurred.

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