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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Available-for-sale
Cost	$ 813.9	$ 790.5
Gross Unrealized Gains	4.1	3.5
Gross Unrealized Losses	(7.3)	(0.2)
Fair Value	810.7	793.8
Bank time deposits
Available-for-sale
Cost	13.1	13.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value		13.1	$ 13.1
Held-to-maturity
Cost	112.0	100.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	112.0	100.2
Commercial paper
Available-for-sale
Cost	49.8	34.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	49.8	34.3
U.S. government and agency securities
Available-for-sale
Cost	112.9	113.2
Gross Unrealized Gains	2.9	0.6
Gross Unrealized Losses	0.0	0.0
Fair Value	115.8	113.8
International government bonds
Available-for-sale
Cost	1.7	1.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	1.7	1.7
Asset-backed securities
Available-for-sale
Cost	157.2	141.2
Gross Unrealized Gains	0.2	0.6
Gross Unrealized Losses	(1.5)	(0.1)
Fair Value	155.9	141.7
Corporate debt securities
Available-for-sale
Cost	479.2	487.0
Gross Unrealized Gains	1.0	2.3
Gross Unrealized Losses	(5.8)	(0.1)
Fair Value	$ 474.4	$ 489.2

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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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