Other Information (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other current assets:
Natural gas and NGLs inventory	$ 39.7	$ 43.4
Prepaid expenses and other	18.9	14.4
Other current assets	58.6	57.8
Other current liabilities:
Accrued interest	35.4	37.1
Accrued wages and benefits, including taxes	15.8	31.5
Accrued ad valorem taxes	23.0	28.5
Capital expenditure accruals	20.6	42.4
Retention liability	11.0	8.7
Short-term lease liability	16.0	21.1
Suspense producer payments	12.1	13.8
Operating expense accruals	9.2	10.8
Other	17.1	12.3
Other current liabilities	$ 160.2	$ 206.2