Commitments and Contingencies - Narrative (Details) kg in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) location kg	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Outstanding letters of credit		$ 88.8	$ 15.7
Minimum number of kilograms required to be purchased (in kilograms) | kg		13.7
Purchase commitment term		10 years
Minimum purchase commitment		$ 23.3
Notice period		2 years
Number of locations | location		11
Accrued liabilities for remediation		$ 9.2
Ecolab
Loss Contingencies [Line Items]
Payments made under supply agreements		$ 25.0
Interest rate under supply agreement		4.00%
Discounts to be paid under supply agreement		$ 30.0
Fair value of expected future cash flows		$ 14.9
Oklahoma Department of Environmental Quality
Loss Contingencies [Line Items]
Accrued liabilities for remediation			2.0
Indemnification Agreement
Loss Contingencies [Line Items]
Indemnification accrual			$ 3.4
Indemnification expense	$ 3.0