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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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