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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]          
Investments used to satisfy nonqualified benefit plans obligations   $ 62.9 $ 59.3 $ 62.9  
Unrealized gains (losses) on investments, net of insurance proceeds     $ 5.9 $ 7.4 $ (11.2)
Investment withdrawal, reduction in cost basis $ 9.0 $ 20.0