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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 924.3	$ 790.5
Gross Unrealized Gains	11.6	3.5
Gross Unrealized Losses	0.0	(0.2)
Fair Value	935.9	793.8
Held-to-maturity
Amortized Cost	50.0
Fair Value	50.0
Bank time deposits
Available-for-sale
Amortized Cost	24.1	13.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	24.1	13.1
Held-to-maturity
Amortized Cost	50.0	100.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	50.0	100.2
Commercial paper
Available-for-sale
Amortized Cost	0.0	34.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	34.3
U.S. government and agency securities
Available-for-sale
Amortized Cost	147.0	113.2
Gross Unrealized Gains	2.2	0.6
Gross Unrealized Losses	0.0	0.0
Fair Value	149.2	113.8
Foreign government bonds
Available-for-sale
Amortized Cost	0.0	1.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	1.7
Asset-backed securities
Available-for-sale
Amortized Cost	149.6	141.2
Gross Unrealized Gains	1.9	0.6
Gross Unrealized Losses	0.0	(0.1)
Fair Value	151.5	141.7
Corporate debt securities
Available-for-sale
Amortized Cost	600.8	487.0
Gross Unrealized Gains	7.5	2.3
Gross Unrealized Losses	0.0	(0.1)
Fair Value	608.3	489.2
Municipal securities
Available-for-sale
Amortized Cost	2.8	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 2.8	$ 0.0

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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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