Segment Information - Amortization Expense (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 8,483.2	$ 8,550.9
Permian
Segment Reporting Information [Line Items]
Assets	2,358.6	2,236.3
Louisiana
Segment Reporting Information [Line Items]
Assets	2,428.6	2,312.4
Oklahoma
Segment Reporting Information [Line Items]
Assets	2,619.5	2,847.6
North Texas
Segment Reporting Information [Line Items]
Assets	896.8	1,008.6
Corporate
Segment Reporting Information [Line Items]
Assets	$ 179.7	$ 146.0