Debt (Narrative) (Details) $ / shares in Units, $ in Millions	2 Months Ended	12 Months Ended
Dec. 31, 2024 USD ($) Rate $ / shares	Dec. 31, 2024 USD ($) $ / shares Rate	Nov. 07, 2024 USD ($)	Dec. 31, 2023 USD ($)
Long-term debt, carrying amount	$ 476.8	$ 476.8
Subordination to credit facility, facility total	50.0	50.0
Subordination to credit facility, facility maximum net borrowing	40.0	40.0
Long-term debt	$ 472.5	$ 472.5		$ 89.6
Debt Instrument, Interest Rate, Effective Percentage \| Rate	2.87%	2.87%
Debt Instrument, Convertible, Conversion Ratio		10.2564
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 97.5	$ 97.5
Convertible Debt Conversion Terms One
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger \| Rate	98.00%
Debt Instrument, Convertible, Threshold Trading Days \| Rate	5
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| Rate	10
Convertible Debt Conversion Terms Two
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger \| Rate	130.00%
Debt Instrument, Convertible, Threshold Trading Days \| Rate	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| Rate	30
Senior Notes [Member]
Debt instrument interest rate	8.25%	8.25%
Long-term debt, face amount	$ 486.0	$ 486.0		89.6
Long-term debt, current	$ 6.1	$ 6.1		$ 6.1
2.25% Convertible Notes
Debt instrument interest rate \| Rate	2.25%	2.25%
Debt Issuance Costs, Gross			$ 13.8
Debt Issuance Costs, Net	$ 13.5	$ 13.5
Long-term debt	389.0	389.0
2.25% Convertible Notes \| Senior Notes [Member]
Long-term debt, face amount	$ 402.5	$ 402.5

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The price per share of the conversion feature embedded in the debt instrument.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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