Segment Information - Reconciliation of Reportable Segment Operating Margin to Income (Loss) Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021
Reconciliation of reportable segment operating margin to income (loss) before income taxes:
Depreciation and amortization expense	$ (209.1)		$ (216.2)
General and administrative expense	(67.1)		(61.4)
Interest expense, net	(93.6)		(98.4)
Equity earnings (loss)	5.6		11.8
Gain (loss) on sale or disposition of assets	1.0
Write-down of assets	(0.5)		(3.5)
Gain (loss) from financing activities	(15.8)		(14.7)
Other, net	(0.4)
Income (loss) before income taxes	191.5		242.9
Gathering and Processing [Member]
Reconciliation of reportable segment operating margin to income (loss) before income taxes:
Operating margin	397.6	[1]	275.1	[2]
Logistics and Transportation [Member]
Reconciliation of reportable segment operating margin to income (loss) before income taxes:
Operating margin	352.1	[1]	348.7	[2]
Other [Member]
Reconciliation of reportable segment operating margin to income (loss) before income taxes:
Operating margin	$ (178.3)	[1]	$ 1.5	[2]

[1] Assets in the Corporate and Eliminations column primarily include tax-related assets, cash, prepaids and debt issuance costs for our revolving credit facilities.

[2] Operating margin is calculated by subtracting Product purchases and fuel and Operating expenses from Revenues.