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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Held-to-maturity
Fair Value	$ 35.0
Available-for-sale
Amortized Cost	1,139.6	$ 924.3
Gross Unrealized Gains	7.6	11.6
Gross Unrealized Losses	(1.2)	0.0
Fair Value	1,146.0	935.9
Bank time deposits
Held-to-maturity
Amortized Cost	35.0	50.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	35.0	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	13.2	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	13.2	0.0
U.S. government and agency securities
Available-for-sale
Amortized Cost	141.7	147.0
Gross Unrealized Gains	1.4	2.2
Gross Unrealized Losses	(0.2)	0.0
Fair Value	142.9	149.2
Asset-backed securities
Available-for-sale
Amortized Cost	211.5	149.6
Gross Unrealized Gains	1.2	1.9
Gross Unrealized Losses	(0.2)	0.0
Fair Value	212.5	151.5
Corporate debt securities
Available-for-sale
Amortized Cost	767.4	600.8
Gross Unrealized Gains	5.0	7.5
Gross Unrealized Losses	(0.8)	0.0
Fair Value	771.6	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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