Segment Information - Other Financial Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Other financial information [Abstract]
Total assets		$ 15,334.3		$ 15,334.3		$ 15,208.2
Operating Segments [Member]
Other financial information [Abstract]
Total assets	[1]	15,334.3	$ 15,411.8	15,334.3	$ 15,411.8
Goodwill		45.2	45.2	45.2	45.2
Capital expenditures		243.7	115.5	406.2	199.0
Operating Segments [Member] | Gathering and Processing [Member]
Other financial information [Abstract]
Total assets	[1]	8,253.4	8,494.2	8,253.4	8,494.2
Goodwill		45.2	45.2	45.2	45.2
Capital expenditures		196.7	114.0	329.7	183.5
Operating Segments [Member] | Logistics and Transportation [Member]
Other financial information [Abstract]
Total assets	[1]	6,915.0	6,687.2	6,915.0	6,687.2
Capital expenditures		42.6	14.8	67.8	25.2
Operating Segments [Member] | Other [Member]
Other financial information [Abstract]
Total assets	[1]	0.8	46.8	0.8	46.8
Operating Segments [Member] | Corporate and Eliminations [Member]
Other financial information [Abstract]
Total assets	[1]	165.1	183.6	165.1	183.6
Capital expenditures		$ 4.4	$ (13.3)	$ 8.7	$ (9.7)

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