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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale
Cost	$ 810.0	$ 790.5
Gross Unrealized Gains	12.1	3.5
Gross Unrealized Losses	(0.2)	(0.2)
Fair Value	821.9	793.8
Bank time deposits
Available-for-sale
Cost	33.2	13.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	33.2	13.1
Held-to-maturity
Cost	0.0	100.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	100.2
Commercial paper
Available-for-sale
Cost	47.5	34.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	47.5	34.3
U.S. government and agency securities
Available-for-sale
Cost	128.0	113.2
Gross Unrealized Gains	3.0	0.6
Gross Unrealized Losses	0.0	0.0
Fair Value	131.0	113.8
Foreign 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	141.6	141.2
Gross Unrealized Gains	1.7	0.6
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	143.2	141.7
Corporate debt securities
Available-for-sale
Cost	458.0	487.0
Gross Unrealized Gains	7.4	2.3
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	$ 465.3	$ 489.2

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