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Investments - Investments in Equity Securities (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Equity Securities  
Beginning balance $ 77.8
New investments 3.4
(Decrease) increase in fair value of investments in equity securities (2.6)
Foreign currency translation adjustments and other (0.6)
Ending balance 78.0
Investment in Equity Securities Level 1  
Equity Securities  
Beginning balance 31.3
New investments 0.0
(Decrease) increase in fair value of investments in equity securities (3.7)
Foreign currency translation adjustments and other (0.7)
Ending balance 26.9
Investment in Equity Securities, Level 2  
Equity Securities  
Beginning balance 6.2
New investments 0.0
(Decrease) increase in fair value of investments in equity securities 1.1
Foreign currency translation adjustments and other 0.1
Ending balance 7.4
Investments in Equity Securities, All Others  
Equity Securities  
Beginning balance 40.3
New investments 3.4
(Decrease) increase in fair value of investments in equity securities 0.0
Foreign currency translation adjustments and other 0.0
Ending balance $ 43.7