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INVESTMENTS - SUMMARY OF INVESTMENTS BY CONTRACTUAL MATURITY (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jan. 01, 2020
Amortized cost
Due in one year or less	$ 237.0	$ 388.7
Due after one year through five years	1,081.0	987.4
Due after five years through ten years	1,440.6	1,540.4
Due after ten years	12,816.0	11,681.0
Subtotal	15,574.6	14,597.5
Structured securities	5,123.4	5,323.6
Amortized cost	20,698.0	19,921.1
Estimated fair value
Due in one year or less	240.5	396.4
Due after one year through five years	1,150.7	1,052.9
Due after five years through ten years	1,584.1	1,715.6
Due after ten years	15,363.7	14,566.5
Subtotal	18,339.0	17,731.4
Structured securities	5,467.6	5,652.2
Total fixed maturities, available for sale	$ 23,806.6	$ 23,383.6	$ 21,293.1

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