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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Aug. 18, 2025	Dec. 31, 2024	Nov. 07, 2024
8.25 Percent Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, face amount	$ 74.3
2.25 Percent Convertible Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, face amount				$ 402.5
0.0 Percent Convertible Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, face amount		$ 805.0
Senior Notes [Member] | 8.25 Percent Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, long-term and short-term, combined carrying value	0.0		$ 89.6
Long-term debt, fair value	0.0		73.6
Long-term debt, face amount	$ 0.0		74.3
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Senior Notes [Member] | 2.25 Percent Convertible Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, long-term and short-term, combined carrying value	$ 390.6		389.0
Long-term debt, fair value	1,339.8		403.8
Long-term debt, face amount	402.5		402.5
Senior Notes [Member] | 0.0 Percent Convertible Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, long-term and short-term, combined carrying value	782.9		0.0
Long-term debt, fair value	1,270.4		0.0
Long-term debt, face amount	$ 805.0	$ 805.0	$ 0.0

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

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

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