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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Held-to-maturity
Amortized Cost	$ 64.5
Fair Value	64.5
Available-for-sale
Amortized Cost	926.1	$ 1,549.1
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(27.5)	(68.1)
Fair Value	898.7	1,481.0
Bank time deposits
Held-to-maturity
Amortized Cost	64.5	96.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	64.5	96.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	72.7	137.7
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(2.8)	(6.1)
Fair Value	70.0	131.6
Asset-backed securities
Available-for-sale
Amortized Cost	192.1	380.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(7.8)	(14.0)
Fair Value	184.3	366.6
Corporate debt securities
Available-for-sale
Amortized Cost	658.5	1,028.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(16.7)	(47.8)
Fair Value	641.8	980.3
Municipal securities
Available-for-sale
Amortized Cost	2.8	2.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	(0.2)
Fair Value	$ 2.6	$ 2.5

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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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