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Fair Value Measurements - Fair Value, Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities | $ 131.0 | $ 126.2
Redeemable noncontrolling interests | 56.5 | 42.0
Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities | 40.6 | 37.6
Other Noncurrent Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities | 90.4 | 88.6
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities | 4.4 | 4.0
Redeemable noncontrolling interests | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities | 126.6 | 122.2
Redeemable noncontrolling interests | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract] |  |
Equity securities | 0.0 | 0.0
Redeemable noncontrolling interests | $ 56.5 | $ 42.0

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