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Share-Based Compensation - Total Share-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense	$ 6.1	$ 5.9	$ 17.5	$ 17.8
Restricted stock units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense	3.0	2.5	8.4	7.4
Performance share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense	1.9	2.3	5.7	7.3
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense	$ 1.2	$ 1.1	$ 3.4	$ 3.1

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- Definition

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

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