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Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
RSUs
Stock-Based Compensation
Stock-based Compensation Expense	$ 0.9	$ 1.3	$ 2.9	$ 4.1
Associated tax benefit from stock-based compensation expense	0.2	0.3	0.7	1.0
Unrecognized compensation expense	6.7		$ 6.7
Period for unrecognized compensation expense expected to be recognized			2 years 5 months 12 days
Employee Stock Option
Stock-Based Compensation
Stock-based Compensation Expense	0.0		$ 0.1	0.4
Associated tax benefit from stock-based compensation expense	0.0	0.1
Unrecognized compensation expense	0.0		0.0
Stock Appreciation Rights (SARs)
Stock-Based Compensation
Stock-based Compensation Expense	0.0	2.2	0.9	6.9
PSUs
Stock-Based Compensation
Stock-based Compensation Expense	0.7	1.1	1.8	2.6
Associated tax benefit from stock-based compensation expense	0.2	0.3	0.5	0.6
Unrecognized compensation expense	3.6		$ 3.6
Period for unrecognized compensation expense expected to be recognized			1 year 8 months 19 days
Maximum | Employee Stock Option
Stock-Based Compensation
Associated tax benefit from stock-based compensation expense		$ 0.1	$ 0.1	$ 0.1
Maximum | Stock Appreciation Rights (SARs)
Stock-Based Compensation
Unrecognized compensation expense	$ 0.0		$ 0.0

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- Definition

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