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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Held-to-maturity
Amortized Cost	$ 162.0
Fair Value	162.0
Available-for-sale
Amortized Cost	2,192.7	$ 924.3
Gross Unrealized Gains	2.9	11.6
Gross Unrealized Losses	(11.9)	0.0
Fair Value	2,183.7	935.9
Bank time deposits
Held-to-maturity
Amortized Cost	162.0	50.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	162.0	50.0
Available-for-sale
Amortized Cost	2.5	24.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	2.5	24.1
Commercial paper
Available-for-sale
Amortized Cost	127.7	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	127.7	0.0
United States government and agency securities
Available-for-sale
Amortized Cost	147.4	147.0
Gross Unrealized Gains	0.6	2.2
Gross Unrealized Losses	(0.7)	0.0
Fair Value	147.3	149.2
Asset-backed securities
Available-for-sale
Amortized Cost	515.2	149.6
Gross Unrealized Gains	0.3	1.9
Gross Unrealized Losses	(2.9)	0.0
Fair Value	512.6	151.5
Corporate debt securities
Available-for-sale
Amortized Cost	1,397.1	600.8
Gross Unrealized Gains	2.0	7.5
Gross Unrealized Losses	(8.3)	0.0
Fair Value	1,390.8	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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