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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 - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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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 | $ 9.5 | $ 11.6
Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 41.8 | 45.3
Level 1 | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 9.5 | 11.6
Level 1 | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 41.8 | 45.3
Level 2 | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0.0 | 0.0
Level 2 | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0.0 | 0.0
Level 3 | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0.0 | 0.0
Level 3 | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 0.0 | $ 0.0

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