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INVESTMENTS - Investments in Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Held-to-maturity
Fair Value	$ 65.2
Available-for-sale
Amortized Cost	1,711.0	$ 2,192.7
Gross Unrealized Gains	0.0	2.9
Gross Unrealized Losses	(67.6)	(11.9)
Fair Value	1,643.4	2,183.7
Bank time deposits
Held-to-maturity
Amortized Cost	65.2	162.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	65.2	162.0
Available-for-sale
Amortized Cost	0.0	2.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	2.5
Commercial paper
Available-for-sale
Amortized Cost	0.0	127.7
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	0.0	127.7
United States government and agency securities
Available-for-sale
Amortized Cost	109.5	147.4
Gross Unrealized Gains	0.0	0.6
Gross Unrealized Losses	(4.7)	(0.7)
Fair Value	104.8	147.3
Asset-backed securities
Available-for-sale
Amortized Cost	419.3	515.2
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	(13.7)	(2.9)
Fair Value	405.6	512.6
Corporate debt securities
Available-for-sale
Amortized Cost	1,179.4	1,397.1
Gross Unrealized Gains	0.0	2.0
Gross Unrealized Losses	(49.0)	(8.3)
Fair Value	1,130.4	1,390.8
Municipal securities
Available-for-sale
Amortized Cost	2.8	2.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	0.0
Fair Value	$ 2.6	$ 2.8

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