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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Held-to-maturity
Fair Value	$ 50.5
Available-for-sale
Amortized Cost	900.9	$ 926.1
Gross Unrealized Gains	0.2	0.1
Gross Unrealized Losses	(6.9)	(27.5)
Fair Value	894.2	898.7
Bank time deposits
Held-to-maturity
Amortized Cost	50.5	64.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	50.5	64.5
Available-for-sale
Amortized Cost	17.6	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	17.6	0.0
Commercial paper
Available-for-sale
Amortized Cost	112.9	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	112.9	0.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	185.2	72.7
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(1.2)	(2.8)
Fair Value	184.1	70.0
Asset-backed securities
Available-for-sale
Amortized Cost	80.2	192.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(1.6)	(7.8)
Fair Value	78.6	184.3
Corporate debt securities
Available-for-sale
Amortized Cost	502.2	658.5
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(4.0)	(16.7)
Fair Value	498.3	641.8
Municipal securities
Available-for-sale
Amortized Cost	2.8	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.2)
Fair Value	$ 2.7	$ 2.6

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