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Fair value measurements and financial instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair value measurements and financial instruments |
Schedule of financial instruments recorded on a fair value basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Fair Value Measurements
​ | ​ | ​ | ​ | ​ | Quoted | ​ | ​ | Significant | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | prices in | ​ | ​ | other | ​ | ​ | Significant
​ | ​ | ​ | ​ | ​ | active | ​ | ​ | observable | ​ | ​ | unobservable
​ | ​ | ​ | ​ | ​ | markets | ​ | ​ | input | ​ | ​ | inputs
​ | ​ | Total | ​ | ​ | (Level 1) | ​ | ​ | (Level 2) | ​ | ​ | (Level 3)
​ | (In millions)
Asset (liability) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current marketable securities | $ | 1.9 | ​ | $ | — | ​ | $ | 1.9 | ​ | $ | —
Noncurrent marketable securities | ​ | 5.7 | ​ | ​ | 2.6 | ​ | ​ | 3.1 | ​ | ​ | —
Earn-out liability | ​ | (4.3) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4.3)
September 30, 2025: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current marketable securities | $ | 3.1 | ​ | $ | — | ​ | $ | 3.1 | ​ | $ | —
Noncurrent marketable securities | ​ | 5.8 | ​ | ​ | 2.9 | ​ | ​ | 2.9 | ​ | ​ | —
Earn-out liability | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Schedule of financial instruments that are not carried at fair value which require fair value disclosure | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024 |  | September 30, 2025
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair
​ | ​ | amount | ​ | value | ​ | amount | ​ | value
​ | ​ | (In millions)
Cash, cash equivalents and restricted cash equivalents | ​ | $ | 378.6 | ​ | $ | 378.6 | ​ | $ | 223.9 | ​ | $ | 223.9
Long-term debt: | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Kronos fixed rate 9.50% Senior Secured Notes due 2029 | ​ | ​ | 365.4 | ​ | ​ | 403.4 | ​ | ​ | 502.3 | ​ | ​ | 528.7
Kronos fixed rate 3.75% Senior Secured Notes due 2025 | ​ |  | 78.3 | ​ |  | 77.9 | ​ |  | — | ​ |  | —
Kronos revolving credit facility | ​ | ​ | 10.0 | ​ | ​ | 10.0 | ​ | ​ | 70.2 | ​ | ​ | 70.2
LandWell bank note payable | ​ |  | 11.4 | ​ |  | 11.4 | ​ |  | 11.1 | ​ |  | 11.1

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