INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2025

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments in Debt Securities

Investments in debt securities at the end of each period were as follows (in millions):

	June 30, 2025								December 31, 2024
Held-to-maturity	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Bank time deposits	$	44.7	$	—	$	—	$	44.7	$	57.9	$	—	$	—		$	57.9
Available-for-sale
Bank time deposits	$	—	$	—	$	—	$	—	$	13.9	$	—	$	—		$	13.9
Commercial paper	416.4		—		—		416.4		236.5		—		—			236.5
U.S. government and agency securities	249.3		—		(0.7)		248.6		238.1		0.1		(1.1)			237.1
Asset-backed securities	52.0		—		(0.9)		51.1		70.2		—		(1.4)			68.8
Corporate debt securities	121.7		0.1		(1.2)		120.6		465.0		0.1		(2.8)			462.3
Municipal securities	—		—		—		—		2.7		—		—			2.7
Total	$	839.4	$	0.1	$	(2.8)	$	836.7	$	1,026.4	$	0.2	$	(5.3)		$	1,021.3

Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity

The cost and fair value of investments in debt securities, by contractual maturity, as of June 30, 2025, were as follows (in millions):

	Held-to-Maturity				Available-for-Sale
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in 1 year or less	$	44.7	$	44.7	$	745.4	$	744.7
Due after 1 year through 5 years	—		—		28.5		28.0
Instruments not due at a single maturity date (a)	—		—		65.5		64.0
	$	44.7	$	44.7	$	839.4	$	836.7

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(a)     Consists of mortgage-backed and asset-backed securities.

Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position

The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of June 30, 2025 and December 31, 2024, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in millions):

	June 30, 2025
	Less than 12 Months				12 Months or Greater				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
U.S. government and agency securities	$	—	$	—	$	15.6	$	(0.7)	$	15.6	$	(0.7)
Asset-backed securities	8.7		(0.1)		36.3		(0.8)		45.0		(0.9)
Corporate debt securities	—		—		65.0		(1.2)		65.0		(1.2)
	$	8.7	$	(0.1)	$	116.9	$	(2.7)	$	125.6	$	(2.8)

	December 31, 2024
	Less than 12 Months				12 Months or Greater				Total
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
U.S. government and agency securities	$	—	$	—	$	19.9	$	(1.1)	$	19.9	$	(1.1)
Asset-backed securities	8.4		(0.1)		53.3		(1.3)		61.7		(1.4)
Corporate debt securities	—		—		141.0		(2.8)		141.0		(2.8)
	$	8.4	$	(0.1)	$	214.2	$	(5.2)	$	222.6	$	(5.3)

Schedule of Investments in Unconsolidated Affiliates

These investments are recorded in Long-term Investments on the consolidated condensed balance sheets, and are as follows (in millions):

	June 30, 2025		December 31, 2024
Equity method investments
Carrying value of equity method investments	$	34.6	$	34.8
Equity securities
Carrying value of marketable equity securities	5.1		5.5
Carrying value of non-marketable equity securities	166.8		119.1
Total investments in unconsolidated entities	$	206.5	$	159.4