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INVESTMENTS - Investments in Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Held-to-maturity
Fair Value	$ 28.0
Available-for-sale
Amortized Cost	1,364.4	$ 1,549.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(55.1)	(68.1)
Fair Value	1,309.3	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	108.6	137.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(4.9)	(6.1)
Fair Value	103.7	131.6
Asset-backed securities
Available-for-sale
Amortized Cost	304.2	380.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(11.2)	(14.0)
Fair Value	293.0	366.6
Corporate debt securities
Available-for-sale
Amortized Cost	948.8	1,028.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(38.8)	(47.8)
Fair Value	910.0	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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