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Investments - Schedule of Realized and Unrealized Gains and Losses on Investments (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Unrealized losses on equity securities held as of the end of the period $ (0.7) $ 0.9 $ 0.2 $ 3.2