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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, long-term and short-term, combined carrying value	$ 89.6	$ 95.7
Long-term debt, current	6.1	6.1
Long-term debt, fair value	73.6	71.7
Long-term debt, face amount	486.0	89.6
Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, long-term and short-term, combined carrying value	389.0	0.0
Long-term debt, fair value	$ 403.8	$ 0.0

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- Definition

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

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

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