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Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 3.8	$ 3.9	$ 7.4	$ 7.9
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	0.0	0.1	0.0	0.3
Time-based restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	2.4	2.5	4.9	5.4
Performance-based restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	1.4	1.3	2.4	2.1
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 0.0	$ 0.0	$ 0.1	$ 0.1

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- Definition

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

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