Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Stock Award Plans and Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($) $ in Millions				3 Months Ended	9 Months Ended
	Aug. 21, 2021	Apr. 23, 2021	Feb. 19, 2021	Sep. 30, 2021	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grants forfeited (in shares)				337,500
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		344,826	5,250,000
Awards forfeited in period (in shares)	337,500		921,838
Share-based payment charges				$ 1.1	$ 7.4
Restricted Stock Award \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		50.00%	25.00%
Restricted Stock Award \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		50.00%	50.00%