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INVESTMENTS - Investments in Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Held-to-maturity
Fair Value	$ 28.1
Available-for-sale
Amortized Cost	1,233.6	$ 1,549.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(49.2)	(68.1)
Fair Value	1,184.4	1,481.0
Bank time deposits
Held-to-maturity
Amortized Cost	28.1	96.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	28.1	96.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	103.4	137.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(5.0)	(6.1)
Fair Value	98.4	131.6
Asset-backed securities
Available-for-sale
Amortized Cost	262.5	380.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(10.0)	(14.0)
Fair Value	252.5	366.6
Corporate debt securities
Available-for-sale
Amortized Cost	864.9	1,028.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(34.0)	(47.8)
Fair Value	830.9	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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