Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 30.9	$ 30.9		$ 92.7	$ 92.8
Operating Segments | Permian
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss				$ 184.6
Operating Segments | Louisiana
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss			$ 186.5
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets				10 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets				20 years
Weighted average
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets				15 years