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Investments - Investments in Equity Securities (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Equity Securities  
Balance at December 31, 2023 $ 91.2
New investments 6.0
(Decrease) increase in fair value of investments in equity securities (1.7)
Foreign currency translation adjustments and other (0.2)
Balance at March 31, 2024 95.3
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 (2.0)
Foreign currency translation adjustments and other (0.1)
Balance at March 31, 2024 2.7
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 0.1
Foreign currency translation adjustments and other 0.0
Balance at March 31, 2024 6.2
Investments in Equity Securities, All Others  
Equity Securities  
Balance at December 31, 2023 80.3
New investments 6.0
(Decrease) increase in fair value of investments in equity securities 0.2
Foreign currency translation adjustments and other (0.1)
Balance at March 31, 2024 $ 86.4