Other Long-term Liabilities - Components of Deferred Revenue (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Revenue Arrangement [Line Items]
Total deferred revenue		$ 248.8	$ 198.8	$ 171.8
Splitter Agreement [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue		129.0	129.0
Gas Contract Amendment [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue		29.8	32.3
Contributions in Aid of Construction [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	[1]	86.4	31.7
Other
Deferred Revenue Arrangement [Line Items]
Total deferred revenue		$ 3.6	$ 5.8

[1] Increase in contributions in aid of construction was due to additions of deferred revenue in West Texas and Badlands.