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Stock and Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Summary of stock-based compensation expense by type of award

The following table summarizes our stock-based compensation expense by type of award (in millions):

			Three Months Ended September 30,												Nine Months Ended September 30,
			2023						2022						2023						2022
PRSUs			$	1.5					$	1.3					$	3.4					$	15.1
RSUs			1.9						0.9						7.1						3.4
Service options			0.2						0.2						0.5						0.6
Market options			0.6						0.9						2.1						3.5
Total stock-based compensation expense			$	4.2					$	3.3					$	13.1					$	22.6

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- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation award.

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