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INVESTMENTS - Investments in Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Held-to-maturity
Fair Value	$ 160.0
Available-for-sale
Amortized Cost	1,888.4	$ 2,192.7
Gross Unrealized Gains	0.2	2.9
Gross Unrealized Losses	(52.0)	(11.9)
Fair Value	1,836.6	2,183.7
Bank time deposits
Held-to-maturity
Amortized Cost	160.0	162.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	160.0	162.0
Available-for-sale
Amortized Cost	4.5	2.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	4.5	2.5
Commercial paper
Available-for-sale
Amortized Cost	23.1	127.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	23.1	127.7
United States government and agency securities
Available-for-sale
Amortized Cost	142.5	147.4
Gross Unrealized Gains	0.0	0.6
Gross Unrealized Losses	(4.0)	(0.7)
Fair Value	138.5	147.3
Asset-backed securities
Available-for-sale
Amortized Cost	451.0	515.2
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	(10.8)	(2.9)
Fair Value	440.2	512.6
Corporate debt securities
Available-for-sale
Amortized Cost	1,264.5	1,397.1
Gross Unrealized Gains	0.2	2.0
Gross Unrealized Losses	(37.0)	(8.3)
Fair Value	1,227.7	1,390.8
Municipal securities
Available-for-sale
Amortized Cost	2.8	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	0.0
Fair Value	$ 2.6	$ 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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