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INVESTMENTS - SUMMARY OF CARRYING VALUE AND ESTIMATED FAIR VALUE OF OUTSTANDING COMMERCIAL MORTGAGE LOANS AND UNDERLYING COLLATERAL (Details) - Commercial Portfolio Segment
$ in Millions
Jun. 30, 2021
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 $ 60.3
2020 47.1
2019 99.8
2018 121.9
2017 76.1
Prior 813.7
Total amortized cost 1,218.9
Estimated fair value 1,281.0
Collateral 3,252.1
Less than 60%  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 40.3
2020 28.5
2019 87.7
2018 113.5
2017 65.5
Prior 620.5
Total amortized cost 956.0
Estimated fair value 1,017.6
Collateral 2,883.2
60% to less than 70%  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 20.0
2020 6.0
2019 0.0
2018 8.4
2017 10.6
Prior 77.5
Total amortized cost 122.5
Estimated fair value 125.8
Collateral 189.2
70% to less than 80%  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0.0
2020 12.6
2019 12.1
2018 0.0
2017 0.0
Prior 42.2
Total amortized cost 66.9
Estimated fair value 68.5
Collateral 92.5
80% to less than 90%  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0.0
2020 0.0
2019 0.0
2018 0.0
2017 0.0
Prior 63.5
Total amortized cost 63.5
Estimated fair value 61.3
Collateral 76.5
90% or greater  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0.0
2020 0.0
2019 0.0
2018 0.0
2017 0.0
Prior 10.0
Total amortized cost 10.0
Estimated fair value 7.8
Collateral $ 10.7