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Investments - Investments in Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Equity Securities |  |
Beginning balance | $ 91.2 | $ 96.5
New investments | 13.1 | 8.7
(Decrease) increase in fair value of investments in equity securities | 10.7 | (14.4)
Foreign currency translation adjustments and other | (0.4) | 0.4
Ending balance | 114.6 | 91.2
Investment in Equity Securities, Level 1 |  |
Equity Securities |  |
Beginning balance | 4.8 | 17.2
New investments | 0.0 | 0.0
(Decrease) increase in fair value of investments in equity securities | (3.1) | (12.7)
Foreign currency translation adjustments and other | (0.2) | 0.3
Ending balance | 1.5 | 4.8
Investment in Equity Securities, Level 2 |  |
Equity Securities |  |
Beginning balance | 6.1 | 7.8
New investments | 0.0 | 0.0
(Decrease) increase in fair value of investments in equity securities | 1.8 | (1.7)
Foreign currency translation adjustments and other | 0.0 | 0.0
Ending balance | 7.9 | 6.1
Investments in Equity Securities, All Others |  |
Equity Securities |  |
Beginning balance | 80.3 | 71.5
New investments | 13.1 | 8.7
(Decrease) increase in fair value of investments in equity securities | 12.0 | 0.0
Foreign currency translation adjustments and other | (0.2) | 0.1
Ending balance | $ 105.2 | $ 80.3

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