Decommissioning Liabilities (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended
Feb. 02, 2021	Mar. 31, 2021	Mar. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]
Decommissioning liabilities			$ 193.0	$ 190.4
Accretion Expense associated with our decommissioning liabilities	$ 0.5	$ 1.0	$ 2.7

Amount of accretion expense, which includes, but is not limited to, accretion expense from asset retirement obligations, environmental remediation obligations, and other contingencies.

No definition available.

Name:	us-gaap_AccretionExpenseIncludingAssetRetirementObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration