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Financial Instruments - Unrealized Gains and Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value Disclosures [Abstract]    
Unrealized gross gains $ 1.4 $ 3.4
Unrealized gross losses 44.3 37.9
Fair value of securities in an unrealized gain position 104.7 159.2
Fair value of securities in an unrealized loss position $ 508.4 $ 452.0