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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 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
​ | ​ | Total | ​ | Assets (Level 1) | ​ | (Level 2) | ​ | (Level 3)
June 30, 2024: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments | ​ | $ | 49.7 | ​ | $ | — | ​ | $ | 49.7 | ​ | $ | —
Long-term investments | ​ | ​ | 0.2 | ​ | ​ | — | ​ | ​ | 0.2 | ​ | ​ | —
Forward contracts | ​ | ​ | (2.2) | ​ | ​ | — | ​ | ​ | (2.2) | ​ | ​ | —
Redeemable noncontrolling interests | ​ | ​ | (19.9) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (19.9)
Total | ​ | $ | 27.8 | ​ | $ | — | ​ | $ | 47.7 | ​ | $ | (19.9)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 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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