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Segment Information - Reconciliation of Reportable Segment Operating Margin to Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2018
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of reportable segment operating margin to income (loss) before income taxes:            
Operating margin       $ 2,375.4 $ 1,759.7 $ 1,523.8
Depreciation and amortization expense       (865.1) (971.6) (815.9)
General and administrative expense       (254.6) (280.7) (256.9)
Impairment of long-lived assets $ (2,442.8)     (2,442.8) (225.3)  
Impairment of goodwill   $ (210.0)       (210.0)
Interest expense, net       (391.3) (337.8) (185.8)
Equity earnings (loss)       72.6 39.0 7.3
Gain (loss) on sale or disposition of business and assets       (58.4) (71.1) 0.1
Write-down of assets [1]       (55.6) (17.9)  
Gain (loss) from financing activities     $ 61.1 45.6 (1.4) (2.0)
Gain (loss) from sale of equity-method investment         69.3  
Change in contingent considerations       0.3 (8.7) 8.8
Other, net       0.8 (0.2) (3.5)
Income (loss) before income taxes       (1,573.1) (46.7) 65.9
Gathering and Processing [Member]            
Reconciliation of reportable segment operating margin to income (loss) before income taxes:            
Operating margin       1,017.7 1,006.4 939.2
Logistics and Transportation [Member]            
Reconciliation of reportable segment operating margin to income (loss) before income taxes:            
Operating margin       1,128.0 867.2 592.5
Other [Member]            
Reconciliation of reportable segment operating margin to income (loss) before income taxes:            
Operating margin       $ 229.7 $ (113.9) $ (7.9)
[1] Related to the write-down of certain assets to their recoverable amounts.