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Fair Value Measurements - Fair Value, Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	$ 104.1
U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	44.8
Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	59.3
Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	35.7	$ 130.9
Redeemable noncontrolling interests	54.4	56.5
Recurring | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	44.8
Recurring | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	59.3
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	20.0	4.2
Redeemable noncontrolling interests	0.0	0.0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	44.8
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	0.0
Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	15.7	126.7
Redeemable noncontrolling interests	0.0	0.0
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	0.0
Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	59.3
Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	0.0	0.0
Redeemable noncontrolling interests	54.4	$ 56.5
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	0.0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available for sale debt securities:	$ 0.0

X

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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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