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Derivative Instruments, Hedging Activities and Fair Value Measurements, Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses)		$ 67.7	$ (17.7)	$ (23.0)
Mark-to-market gains (losses) in interest expense		(94.9)	(0.1)	0.2
Total mark-to-market gains (losses)		(27.2)	(17.8)	(22.8)
NGL Pipelines & Services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses)		(5.5)	18.0	(11.2)
Crude Oil Pipelines & Services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses)		80.6	(44.1)	(4.8)
Natural Gas Pipelines & Services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses)		(0.2)	6.7	(9.4)
Petrochemical & Refined Products Services [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses)		(7.2)	1.7	2.4
Derivatives in fair value hedging relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		2.2	11.2	0.9
Gain (Loss) Recognized in Income on Hedged Item		6.9	(8.3)	27.8
Derivatives in fair value hedging relationships [Member] | Interest rate derivatives [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		0.0	1.3	(0.2)
Gain (Loss) Recognized in Income on Hedged Item		0.0	(1.4)	0.4
Derivatives in fair value hedging relationships [Member] | Commodity derivatives [Member] | Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		2.2	9.9	1.1
Gain (Loss) Recognized in Income on Hedged Item		6.9	(6.9)	27.4
Derivatives in cash flow hedging relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative		125.5	315.4	(44.2)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income		104.4	92.3	(152.6)
Derivatives in cash flow hedging relationships [Member] | Interest rate derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative		81.4	22.2	(5.7)
Accumulated other comprehensive loss related to interest rate derivative instruments expected to be reclassified to earnings in interest expense over the next twelve months		(39.7)
Derivatives in cash flow hedging relationships [Member] | Interest rate derivatives [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income		(37.3)	(38.1)	(40.4)
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to earnings over the next twelve months		55.7
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to revenue over the next twelve months		55.4
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to operating costs and expenses over the next twelve months		0.3
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] | Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative	[1]	55.8	293.0	(33.7)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income		152.4	131.7	(111.6)
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] | Operating costs and expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative	[1]	(11.7)	0.2	(4.8)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income		(10.7)	(1.3)	(0.6)
Derivatives not designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		(5.1)	(454.7)	(42.6)
Derivatives not designated as hedging instruments [Member] | Interest rate derivatives [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		(94.9)	0.0	0.0
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains (losses)		24.2
Unrealized gains (losses)		65.6
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		102.2	(462.9)	(42.7)
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Operating costs and expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative		$ (12.4)	$ 8.2	$ 0.1
[1] The fair value of these derivative instruments will be reclassified to their respective locations on the Statement of Consolidated Operations upon settlement of the underlying derivative transactions, as appropriate.

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings (operating costs and expenses) within the next twelve months.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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