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Investments - Investments in Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Equity Securities |  |
Beginning balance | $ 96.5 | $ 77.8
New investments | 8.7 | 9.4
Decrease in fair value of investments in equity securities | (14.4) | 13.1
Foreign currency translation adjustments and other | 0.4 | (3.8)
Ending balance | 91.2 | 96.5
Investment in Equity Securities Level 1 |  |
Equity Securities |  |
Beginning balance | 17.2 | 31.3
New investments | 0.0 | 0.0
Decrease in fair value of investments in equity securities | (12.7) | (11.8)
Foreign currency translation adjustments and other | 0.3 | (2.3)
Ending balance | 4.8 | 17.2
Investment in Equity Securities, Level 2 |  |
Equity Securities |  |
Beginning balance | 7.8 | 6.2
New investments | 0.0 | 0.0
Decrease in fair value of investments in equity securities | (1.7) | 1.6
Foreign currency translation adjustments and other | 0.0 | 0.0
Ending balance | 6.1 | 7.8
Investments in Equity Securities, All Others |  |
Equity Securities |  |
Beginning balance | 71.5 | 40.3
New investments | 8.7 | 9.4
Decrease in fair value of investments in equity securities | 0.0 | 23.3
Foreign currency translation adjustments and other | 0.1 | (1.5)
Ending balance | $ 80.3 | $ 71.5

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