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Investments - Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Cost $ 38.7 $ 30.0
Unrealized gains 2.8 3.7
Unrealized losses (0.2) (1.4)
Fair value $ 41.3 $ 32.3