Other Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	May 31, 2019	Dec. 31, 2018
Other current assets:
Natural gas and NGLs inventory	$ 43.4		$ 41.3
Secured term loan receivable from contract restructuring, net of discount of $1.1 at December 31, 2018 (1)	0.0		19.4
Secured term loan receivable, discount			1.1
Prepaid expenses and other	14.4		13.5
Natural gas and NGLs inventory, prepaid expenses, and other	57.8		74.2
Financing receivable, gross		$ 58.0
Other current liabilities:
Accrued interest	37.1		37.5
Accrued wages and benefits, including taxes	25.5		37.2
Accrued ad valorem taxes	28.5		28.1
Capital expenditure accruals	42.4		50.6
Onerous performance obligations	0.0		9.0
Short-term lease liability	21.1		1.5
Suspense producer payments	13.8		34.6
Operating expense accruals	10.8		10.2
Other	27.0		39.5
Other current liabilities	$ 206.2		$ 248.2