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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Held-to-maturity
Fair Value	$ 53.4
Available-for-sale
Amortized Cost	534.3	$ 926.1
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(12.8)	(27.5)
Fair Value	521.6	898.7
Bank time deposits
Held-to-maturity
Amortized Cost	53.4	64.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	53.4	64.5
U.S. government and agency securities
Available-for-sale
Amortized Cost	48.5	72.7
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(2.0)	(2.8)
Fair Value	46.5	70.0
Asset-backed securities
Available-for-sale
Amortized Cost	110.8	192.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(2.7)	(7.8)
Fair Value	108.1	184.3
Corporate debt securities
Available-for-sale
Amortized Cost	372.2	658.5
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(8.0)	(16.7)
Fair Value	364.3	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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