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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale
Cost	$ 711.3	$ 685.3
Gross Unrealized Gains	0.4	0.8
Gross Unrealized Losses	(5.5)	(2.9)
Fair Value	706.2	683.2
Held-to-maturity
Cost	20.0	388.2
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	20.0	388.2
Bank time deposits
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
Held-to-maturity
Cost	20.0	382.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	20.0	382.9
Commercial paper
Available-for-sale
Cost	56.7	40.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	56.7	40.3
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
U.S. government and agency securities
Available-for-sale
Cost	79.7	69.4
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	(0.7)	(0.7)
Fair Value	79.2	68.7
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
International 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	110.6	121.2
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(0.5)	(0.4)
Fair Value	110.2	120.8
Corporate debt securities
Available-for-sale
Cost	459.8	446.5
Gross Unrealized Gains	0.1	0.8
Gross Unrealized Losses	(4.3)	(1.8)
Fair Value	455.6	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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