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INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	$ 1,611.5	$ 1,632.5
Gross unrealized losses, less than twelve months	(48.8)	(11.9)
Fair value, twelve months or greater	58.8	0.0
Gross unrealized losses, twelve months or greater	(3.2)	0.0
Fair value, total	1,670.3	1,632.5
Gross unrealized losses, total	(52.0)	(11.9)
United States government and agency securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	101.8	85.1
Gross unrealized losses, less than twelve months	(3.6)	(0.7)
Fair value, twelve months or greater	9.4	0.0
Gross unrealized losses, twelve months or greater	(0.4)	0.0
Fair value, total	111.2	85.1
Gross unrealized losses, total	(4.0)	(0.7)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	396.5	433.3
Gross unrealized losses, less than twelve months	(10.5)	(2.9)
Fair value, twelve months or greater	15.8	0.0
Gross unrealized losses, twelve months or greater	(0.3)	0.0
Fair value, total	412.3	433.3
Gross unrealized losses, total	(10.8)	(2.9)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	1,110.1	1,114.1
Gross unrealized losses, less than twelve months	(34.5)	(8.3)
Fair value, twelve months or greater	33.6	0.0
Gross unrealized losses, twelve months or greater	(2.5)	0.0
Fair value, total	1,143.7	1,114.1
Gross unrealized losses, total	(37.0)	$ (8.3)
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than twelve months	3.1
Gross unrealized losses, less than twelve months	(0.2)
Fair value, twelve months or greater	0.0
Gross unrealized losses, twelve months or greater	0.0
Fair value, total	3.1
Gross unrealized losses, total	$ (0.2)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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