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Debt (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jul. 30, 2024	Jan. 12, 2022	Apr. 30, 2021
Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility					$ 290.0		$ 250.0
Line of credit, amount available	$ 287.4		$ 287.4
Line of Credit \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term debt outstanding	0.0		0.0
Line of Credit \| Letter of Credit
Line of Credit Facility [Line Items]
Long-term debt outstanding	2.6		2.6
Senior Notes
Line of Credit Facility [Line Items]
Debt issuance costs	5.5		5.5
Senior Notes \| Senior Notes Due 2030
Line of Credit Facility [Line Items]
Convertible notes issued						$ 550.0
Debt instrument, interest rate (as a percent)						5.00%
Interest expense	7.2	$ 7.1	21.5	$ 21.4
Amortization of debt issuance costs	$ 0.3	$ 0.3	$ 0.8	$ 0.8
Effective interest rate (as a percent)	5.40%	5.40%	5.40%	5.40%