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INVESTMENTS - SUMMARY OF INVESTMENTS WITH UNREALIZED LOSSES BY INVESTMENT CATEGORY (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Fair value
Less than 12 months	$ 550.0	$ 885.0
12 months or greater	191.1	324.8
Total	741.1	1,209.8
Unrealized losses
Less than 12 months	(9.2)	(16.3)
12 months or greater	(2.9)	(7.2)
Total	(12.1)	(23.5)
Corporate securities
Fair value
Less than 12 months	211.7	110.0
12 months or greater	9.2	5.6
Total	220.9	115.6
Unrealized losses
Less than 12 months	(7.2)	(2.6)
12 months or greater	(0.1)	(0.2)
Total	(7.3)	(2.8)
United States Treasury securities and obligations of United States government corporations and agencies
Fair value
Less than 12 months	18.9	17.9
12 months or greater	0.0	0.0
Total	18.9	17.9
Unrealized losses
Less than 12 months	(0.7)	(0.2)
12 months or greater	0.0	0.0
Total	(0.7)	(0.2)
States and political subdivisions
Fair value
Less than 12 months	41.7	8.6
12 months or greater	0.0	0.0
Total	41.7	8.6
Unrealized losses
Less than 12 months	(0.5)	(0.1)
12 months or greater	0.0	0.0
Total	(0.5)	(0.1)
Asset-backed securities
Fair value
Less than 12 months	25.4	146.9
12 months or greater	29.4	26.0
Total	54.8	172.9
Unrealized losses
Less than 12 months	0.0	(4.1)
12 months or greater	(1.2)	(3.3)
Total	(1.2)	(7.4)
Non-agency residential mortgage-backed securities
Fair value
Less than 12 months	37.6	173.2
12 months or greater	16.3	42.2
Total	53.9	215.4
Unrealized losses
Less than 12 months	(0.1)	(1.5)
12 months or greater	(0.1)	(0.6)
Total	(0.2)	(2.1)
Collateralized loan obligations
Fair value
Less than 12 months	99.3	151.4
12 months or greater	76.3	178.7
Total	175.6	330.1
Unrealized losses
Less than 12 months	(0.4)	(1.5)
12 months or greater	(0.3)	(2.1)
Total	(0.7)	(3.6)
Commercial mortgage-backed securities
Fair value
Less than 12 months	115.4	277.0
12 months or greater	59.9	72.3
Total	175.3	349.3
Unrealized losses
Less than 12 months	(0.3)	(6.3)
12 months or greater	(1.2)	(1.0)
Total	$ (1.5)	$ (7.3)

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