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INVESTMENTS - Credit Ratings (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 137.2		$ 218.4
Fair Value	$ 139.3		224.0
AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage	100.00%	100.00%
AAA
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 73.2		116.5
Fair Value	$ 74.0		118.7
AAA | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage	53.10%	53.00%
AA+, AA, AA-, A-1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 17.0		22.7
Fair Value	$ 17.3		23.3
AA+, AA, AA-, A-1 | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage	12.50%	10.40%
A+, A, A-
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 36.4		57.5
Fair Value	$ 37.1		59.4
A+, A, A- | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage	26.60%	26.50%
BBB+, BBB, BBB-
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 10.6		21.7
Fair Value	$ 10.9		$ 22.6
BBB+, BBB, BBB- | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage	7.80%	10.10%

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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