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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Held-to-maturity
Fair Value	$ 28.0
Available-for-sale
Amortized Cost	1,059.2	$ 1,549.1
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(38.7)	(68.1)
Fair Value	1,020.6	1,481.0
Bank time deposits
Held-to-maturity
Amortized Cost	28.0	96.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	28.0	96.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	83.9	137.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(4.3)	(6.1)
Fair Value	79.6	131.6
Asset-backed securities
Available-for-sale
Amortized Cost	227.5	380.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(7.8)	(14.0)
Fair Value	219.7	366.6
Corporate debt securities
Available-for-sale
Amortized Cost	745.0	1,028.1
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(26.4)	(47.8)
Fair Value	718.7	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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