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Fair Value Measurements - Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Level 1 - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 10.4 | $ 10.5
Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 0.0 | $ 4.4

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