Equity Incentive Programs - Equity Incentive Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity incentive compensation expense	$ 1.8	$ 1.0
Estimated future compensation expense	11.8
Estimated Future Expense in 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	4.6
Estimated Future Expense in 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	4.5
Estimated Future Expense in 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	2.4
Estimated Future Expense in 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	0.3
Restricted Stock and Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1.8	0.9
Deferred Stock Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.0	$ 0.1

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

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