Asset Retirement Obligations Contingencies - Gypstack (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Discounted asset retirement obligation	$ 2,213.4	$ 1,905.6	$ 1,749.3
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Discounted asset retirement obligation	1,200.0	$ 1,000.0
2015 Consent Decrees With EPA | Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Asset retirement obligations, undiscounted	2,200.0
Discounted asset retirement obligation	$ 819.9