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Investments - Investments in Equity Securities (Details)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
Equity Securities  
Balance at December 31, 2023 $ 91.2
New investments 13.1
(Decrease) increase in fair value of investments in equity securities 10.8
Foreign currency translation adjustments and other 1.1
Balance at September 30, 2024 116.2
Investment in Equity Securities, Level 1  
Equity Securities  
Balance at December 31, 2023 4.8
New investments 0.0
(Decrease) increase in fair value of investments in equity securities (1.8)
Foreign currency translation adjustments and other 0.0
Balance at September 30, 2024 3.0
Investment in Equity Securities, Level 2  
Equity Securities  
Balance at December 31, 2023 6.1
New investments 0.0
(Decrease) increase in fair value of investments in equity securities 0.9
Foreign currency translation adjustments and other 0.0
Balance at September 30, 2024 7.0
Investments in Equity Securities, All Others  
Equity Securities  
Balance at December 31, 2023 80.3
New investments 13.1
(Decrease) increase in fair value of investments in equity securities 11.7
Foreign currency translation adjustments and other 1.1
Balance at September 30, 2024 $ 106.2