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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value Measurements |
Fair values of financial and non-financial assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements |
​ | ​ | ​ | ​ |  | Quoted Prices in |  | Significant |  | Significant |
​ | ​ | ​ | ​ | ​ | Active Markets | ​ | Observable | ​ | Unobservable |
​ | ​ | ​ | ​ | ​ | for Identical | ​ | Inputs | ​ | Inputs |
2024 | ​ | Total | ​ | Assets (Level 1) | ​ | (Level 2) | ​ | (Level 3) |
Short-term investments | ​ | $ | 18.4 | ​ | $ | — | ​ | $ | 18.4 | ​ | $ | — | ​
Long-term investments | ​ | ​ | 0.3 | ​ | ​ | — | ​ | ​ | 0.3 | ​ | ​ | — | ​
Forward contracts | ​ | ​ | (1.1) | ​ | ​ | — | ​ | ​ | (1.1) | ​ | ​ | — | ​
Redeemable noncontrolling interests | ​ | ​ | (8.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (8.7) | ​
Total | ​ | $ | 8.9 | ​ | $ | — | ​ | $ | 17.6 | ​ | $ | (8.7) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
Short-term investments | ​ | $ | 185.2 | ​ | $ | — | ​ | $ | 185.2 | ​ | $ | — | ​
Long-term investments | ​ | ​ | 0.4 | ​ | ​ | — | ​ | ​ | 0.4 | ​ | ​ | — | ​
Forward contracts | ​ | ​ | (0.5) | ​ | ​ | — | ​ | ​ | (0.5) | ​ | ​ | — | ​
Redeemable noncontrolling interests | ​ | ​ | (30.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (30.7) | ​
Total | ​ | $ | 154.4 | ​ | $ | — | ​ | $ | 185.1 | ​ | $ | (30.7) | ​

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