Note 6 - Fair Value Measurements - Change in Level 3 Assets (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Beginning of period fair value | $ 10.8 | $ 1.7 | $ 4.5 | $ 1.1 |
| Fair value adjustments | 1.2 | 1.5 | 0.5 | 2.1 |
| Transfers | 0.0 | 0.7 | 0.0 | 0.7 |
| Transfers from practical expedient | 9.4 | 0.0 | 9.4 | 0.0 |
| Purchases (sales) of securities, net | 3.9 | 0.1 | 10.9 | 0.1 |
| End of period fair value | $ 25.3 | $ 4.0 | $ 25.3 | $ 4.0 |
| X | ||||||||||
- Definition Amount of transfer of financial instrument classified as an asset into (out of) a practical expedient. No definition available.
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| X | ||||||||||
- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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