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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Held-to-maturity
Amortized Cost	$ 96.0
Fair Value	96.0
Available-for-sale
Amortized Cost	1,549.1	$ 2,192.7
Gross Unrealized Gains	0.0	2.9
Gross Unrealized Losses	(68.1)	(11.9)
Fair Value	1,481.0	2,183.7
Bank time deposits
Held-to-maturity
Amortized Cost	96.0	162.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	96.0	162.0
Available-for-sale
Amortized Cost	0.0	2.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	2.5
Commercial paper
Available-for-sale
Amortized Cost	0.0	127.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	127.7
United States government and agency securities
Available-for-sale
Amortized Cost	137.7	147.4
Gross Unrealized Gains	0.0	0.6
Gross Unrealized Losses	(6.1)	(0.7)
Fair Value	131.6	147.3
Asset-backed securities
Available-for-sale
Amortized Cost	380.6	515.2
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	(14.0)	(2.9)
Fair Value	366.6	512.6
Corporate debt securities
Available-for-sale
Amortized Cost	1,028.1	1,397.1
Gross Unrealized Gains	0.0	2.0
Gross Unrealized Losses	(47.8)	(8.3)
Fair Value	980.3	1,390.8
Municipal securities
Available-for-sale
Amortized Cost	2.7	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	0.0
Fair Value	$ 2.5	$ 2.8

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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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