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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale
Amortized Cost	$ 914.7	$ 924.3
Gross Unrealized Gains	8.1	11.6
Gross Unrealized Losses	(1.8)	0.0
Fair Value	921.0	935.9
Bank time deposits
Held-to-maturity
Amortized Cost	0.0	50.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	50.0
Available-for-sale
Amortized Cost	14.1	24.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	14.1	24.1
U.S. government and agency securities
Available-for-sale
Amortized Cost	136.4	147.0
Gross Unrealized Gains	1.8	2.2
Gross Unrealized Losses	(0.1)	0.0
Fair Value	138.1	149.2
Foreign government bonds
Available-for-sale
Amortized Cost	0.0	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	0.0
Asset-backed securities
Available-for-sale
Amortized Cost	161.1	149.6
Gross Unrealized Gains	1.3	1.9
Gross Unrealized Losses	(0.2)	0.0
Fair Value	162.2	151.5
Corporate debt securities
Available-for-sale
Amortized Cost	600.3	600.8
Gross Unrealized Gains	5.0	7.5
Gross Unrealized Losses	(1.5)	0.0
Fair Value	603.8	608.3
Municipal securities
Available-for-sale
Amortized 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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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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