Decommissioning Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Summary of the activity for the Company's decommissioning liabilities
Decommissioning liabilities	$ 173.1	$ 142.7

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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