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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Held-to-maturity
Fair Value	$ 83.0
Available-for-sale
Amortized Cost	1,400.7	$ 924.3
Gross Unrealized Gains	6.2	11.6
Gross Unrealized Losses	(2.1)	0.0
Fair Value	1,404.8	935.9
Bank time deposits
Held-to-maturity
Amortized Cost	83.0	50.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	83.0	50.0
Available-for-sale
Amortized Cost	3.0	24.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	3.0	24.1
Commercial paper
Available-for-sale
Amortized Cost	2.9	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	2.9	0.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	145.8	147.0
Gross Unrealized Gains	1.1	2.2
Gross Unrealized Losses	(0.1)	0.0
Fair Value	146.8	149.2
Asset-backed securities
Available-for-sale
Amortized Cost	300.2	149.6
Gross Unrealized Gains	0.7	1.9
Gross Unrealized Losses	(0.8)	0.0
Fair Value	300.1	151.5
Corporate debt securities
Available-for-sale
Amortized Cost	946.0	600.8
Gross Unrealized Gains	4.4	7.5
Gross Unrealized Losses	(1.2)	0.0
Fair Value	949.2	608.3
Municipal securities
Available-for-sale
Amortized Cost	2.8	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 2.8	$ 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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