Fair Value (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Fair Value Disclosure [Line Items] | ||
| Allowance for Credit Loss | $ 0.0 | $ 0.1 |
| Debt Securities, Available-for-Sale, Realized Gain (Loss) | (1.0) | (2.3) |
| Net Assets | 17.9 | |
| U.S. Treasury debt securities | ||
| Fair Value Disclosure [Line Items] | ||
| Allowance for Credit Loss | 0.0 | |
| Corporate/Other debt securities | ||
| Fair Value Disclosure [Line Items] | ||
| Allowance for Credit Loss | 0.0 | 0.1 |
| Available-for-sale securities, maturities of less than a year | 9.8 | |
| Debt Securities, Available-for-sale, Unrealized Loss Position | 40.2 | $ 70.1 |
| US Treasury Securities | ||
| Fair Value Disclosure [Line Items] | ||
| Available-for-sale securities, maturities of less than a year | 4.0 | |
| Debt Securities, Available-for-sale, Unrealized Loss Position | $ 3.5 | |
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- Definition Fair Value Disclosure [Line Items] No definition available.
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- Definition Amount of net assets (liabilities). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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