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RECENTLY ISSUED ACCOUNTING STANDARDS - IMPACT OF ADOPTION (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Fixed maturities, available for sale $ 23,806.6   $ 23,383.6     $ 21,293.1  
Mortgage loans 1,276.9   1,358.7     1,559.4  
Investments held by variable interest entities 1,233.5   1,189.4     1,178.7  
Income tax assets, net 218.6   199.4     437.5  
Reinsurance receivables 4,460.9   4,584.3     4,781.7  
Total assets 35,519.7   35,339.9     33,613.1  
Retained earnings 944.2   752.3     517.9  
Total shareholders' equity $ 5,324.0 $ 4,860.7 $ 5,484.2 $ 4,731.2 $ 3,765.8 4,659.2 $ 4,677.0
ASU 2016-13 Credit Losses              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Fixed maturities, available for sale           (2.1)  
Mortgage loans           (6.7)  
Investments held by variable interest entities           (9.9)  
Income tax assets, net           4.9  
Reinsurance receivables           (4.0)  
Total assets           (17.8)  
Retained earnings           (17.8)  
Total shareholders' equity           $ (17.8)  
Amounts prior to effect of adoption of authoritative guidance              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Fixed maturities, available for sale             21,295.2
Mortgage loans             1,566.1
Investments held by variable interest entities             1,188.6
Income tax assets, net             432.6
Reinsurance receivables             4,785.7
Total assets             33,630.9
Retained earnings             535.7
Total shareholders' equity             $ 4,677.0