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Stock and Stock-Based Compensation Plan Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	$ 16.5	$ 16.6	$ 13.2
Total income tax benefit recognized (in dollars)	2.2	1.5	1.6
PRSUs
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	4.1	3.4	1.6
RSUs
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	9.0	8.0	5.0
Service options
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	0.7	0.9	1.0
Market Options
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	$ 2.7	$ 4.3	$ 5.6

X

- Definition

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

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