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INVESTMENTS - Investments in Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Held-to-maturity
Fair Value	$ 123.0
Available-for-sale
Amortized Cost	1,718.0	$ 2,192.7
Gross Unrealized Gains	0.0	2.9
Gross Unrealized Losses	(78.0)	(11.9)
Fair Value	1,640.0	2,183.7
Bank time deposits
Held-to-maturity
Amortized Cost	123.0	162.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	123.0	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	143.0	147.4
Gross Unrealized Gains	0.0	0.6
Gross Unrealized Losses	(6.8)	(0.7)
Fair Value	136.2	147.3
Asset-backed securities
Available-for-sale
Amortized Cost	447.9	515.2
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	(15.1)	(2.9)
Fair Value	432.8	512.6
Corporate debt securities
Available-for-sale
Amortized Cost	1,124.3	1,397.1
Gross Unrealized Gains	0.0	2.0
Gross Unrealized Losses	(55.8)	(8.3)
Fair Value	1,068.5	1,390.8
Municipal securities
Available-for-sale
Amortized Cost	2.8	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.3)	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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