Other Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Other current assets:
Natural gas and NGLs inventory	$ 116.6	$ 44.9
Prepaid expenses and other	39.6	13.8
Other current assets	156.2	58.7
Other current liabilities:
Accrued interest	71.7	35.7
Accrued wages and benefits, including taxes	26.0	22.5
Accrued ad valorem taxes	32.4	26.5
Capital expenditure accruals	15.0	10.6
Short-term lease liability	15.8	16.3
Operating expense accruals	11.7	8.4
Other	43.3	29.1
Other current liabilities	$ 215.9	$ 149.1