Debt (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
Nov. 07, 2024 |
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| Long-term debt | $ 1,178.8 | $ 1,178.8 | $ 1,174.8 | |||
| Gain (Loss) on Extinguishment of Debt | 0.0 | $ 0.0 | 0.0 | $ 11.8 | ||
| 2.25% Convertible Notes | ||||||
| Debt Issuance Costs, Net | 9.7 | 9.7 | 11.3 | |||
| 8.25 Percent Note | ||||||
| Long-term debt, face amount | 74.3 | 74.3 | ||||
| Gain (Loss) on Extinguishment of Debt | $ 11.8 | |||||
| 0.0 Percent Convertible Note | ||||||
| Long-term debt, face amount | $ 805.0 | |||||
| Debt Issuance Costs, Net | 19.0 | 19.0 | 21.3 | |||
| Senior Notes [Member] | 2.25% Convertible Notes | ||||||
| Long-term debt, face amount | 402.5 | 402.5 | ||||
| Senior Notes [Member] | 0.0 Percent Convertible Note | ||||||
| Long-term debt, face amount | $ 805.0 | $ 805.0 | $ 805.0 | |||
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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