INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Held-to-maturity
Fair Value	$ 46.8
Available-for-sale
Amortized Cost	1,178.2	$ 1,026.4
Gross Unrealized Gains	0.2	0.2
Gross Unrealized Losses	(2.0)	(5.3)
Fair Value	1,176.4	1,021.3
Bank time deposits
Held-to-maturity
Amortized Cost	46.8	57.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	46.8	57.9
Available-for-sale
Amortized Cost	0.0	13.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	13.9
Commercial paper
Available-for-sale
Amortized Cost	563.8	236.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	563.8	236.5
U.S. government and agency securities
Available-for-sale
Amortized Cost	380.7	238.1
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(0.5)	(1.1)
Fair Value	380.3	237.1
Asset-backed securities
Available-for-sale
Amortized Cost	45.0	70.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.8)	(1.4)
Fair Value	44.2	68.8
Corporate debt securities
Available-for-sale
Amortized Cost	188.7	465.0
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(0.7)	(2.8)
Fair Value	188.1	462.3
Municipal securities
Available-for-sale
Amortized Cost	0.0	2.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 0.0	$ 2.7

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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