Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock-Based Compensation
Fair value	$ 2.4	$ 9.5	$ 17.7
RSUs
Stock-Based Compensation
Stock-based Compensation Expense	4.4	3.8	5.2
Associated tax benefit from stock-based compensation expense	1.1	0.9	1.3
Unrecognized compensation expense	$ 5.9
Period for unrecognized compensation expense expected to be recognized	2 years 4 months 17 days
PSUs
Stock-Based Compensation
Stock-based Compensation Expense	$ 3.2	2.5	2.6
Associated tax benefit from stock-based compensation expense	0.8	0.7	0.8
Unrecognized compensation expense	$ 4.6
Period for unrecognized compensation expense expected to be recognized	2 years 10 days
Employee Stock Option
Stock-Based Compensation
Stock-based Compensation Expense	$ 0.0	0.1	0.5
Associated tax benefit from stock-based compensation expense	0.0	0.1	0.1
Unrecognized compensation expense	0.0
Stock Appreciation Rights (SARs)
Stock-Based Compensation
Stock-based Compensation Expense	0.0	0.9	$ 2.9
Unrecognized compensation expense	$ 0.0	$ 0.0

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

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