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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Held-to-maturity
Cost	$ 190.0	$ 388.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	190.0	388.2
Available-for-sale
Cost	605.8	685.3
Gross Unrealized Gains	0.9	0.8
Gross Unrealized Losses	(5.5)	(2.9)
Fair Value	601.2	683.2
Bank time deposits
Held-to-maturity
Cost	190.0	382.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	190.0	382.9
Available-for-sale
Cost	0.0	0.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	0.5
Commercial paper
Held-to-maturity
Cost	0.0	1.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	1.4
Available-for-sale
Cost	21.2	40.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	21.2	40.3
U.S. government and agency securities
Held-to-maturity
Cost	0.0	3.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	3.9
Available-for-sale
Cost	82.2	69.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.9)	(0.7)
Fair Value	81.3	68.7
Foreign government bonds
Available-for-sale
Cost	1.7	3.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	1.7	3.0
Asset-backed securities
Available-for-sale
Cost	94.1	121.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.7)	(0.4)
Fair Value	93.4	120.8
Corporate debt securities
Available-for-sale
Cost	403.8	446.5
Gross Unrealized Gains	0.9	0.8
Gross Unrealized Losses	(3.9)	(1.8)
Fair Value	400.8	445.5
Municipal securities
Available-for-sale
Cost	2.8	4.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 2.8	$ 4.4

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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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