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Fair Value Measurements - Unrealized Gains (Losses) on Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value Disclosures [Abstract]      
Net unrealized gains in earnings related to investments held at the end of the period $ 10.0   $ 16.0
Net unrealized losses in earnings related to investments held at the end of the period   $ 12.7