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v3.25.3

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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