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Stock-Based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 14.8	$ 9.5	$ 15.2
Stock option compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2.7	3.7	3.6
RSU compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6.4	4.4	5.3
PSU compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 5.7	$ 1.4	$ 6.3

X

- Definition

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

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