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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Held-to-maturity
Cost	$ 30.0
Fair Value	30.0
Available-for-sale
Cost	654.6	$ 711.3
Gross Unrealized Gains	1.5	0.4
Gross Unrealized Losses	(2.2)	(5.5)
Fair Value	653.9	706.2
Bank time deposits
Held-to-maturity
Cost	30.0	20.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	30.0	20.0
Commercial paper
Available-for-sale
Cost	36.0	56.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	36.0	56.7
U.S. government and agency securities
Available-for-sale
Cost	79.7	79.7
Gross Unrealized Gains	0.2	0.2
Gross Unrealized Losses	(0.4)	(0.7)
Fair Value	79.5	79.2
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	102.2	110.6
Gross Unrealized Gains	0.3	0.1
Gross Unrealized Losses	(0.3)	(0.5)
Fair Value	102.2	110.2
Corporate debt securities
Available-for-sale
Cost	432.2	459.8
Gross Unrealized Gains	1.0	0.1
Gross Unrealized Losses	(1.5)	(4.3)
Fair Value	431.7	455.6
Municipal securities
Available-for-sale
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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- Definition

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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