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RECENTLY ADOPTED ACCOUNTING STANDARDS - Transition Adjustments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Present value of future profits                
Balance $ 186.2   $ 203.7 $ 210.0   $ 230.1 $ 259.6  
Deferred acquisition costs                
Balance 1,897.5   1,770.9       1,485.8  
Reinsurance receivables                
Balance             4,728.4  
Market risk benefit asset                
Market risk benefit asset 89.3   65.3 56.3     2.5  
Income tax assets, net                
Balance 1,039.8   1,063.4       806.4  
Policyholder account balances                
Balance 15,481.8   15,234.2 15,079.7     12,367.7  
Future policy benefits                
Future policy benefits 10,829.9   11,240.2       15,704.9  
Market risk benefit liability                
Market risk benefit liability 3.1   11.3 13.7     114.8  
Liability for policy and contract claims                
Balance             91.7  
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity 1,890.1 $ 1,995.8 1,768.8 1,863.4 $ 2,127.9 3,684.7    
Accumulated other comprehensive income (loss)                
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity (1,956.7) (1,733.5) (1,957.3) (1,837.8) (1,415.8) 373.7 106.3  
Retained earnings                
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity $ 1,880.4 $ 1,730.3 1,691.2 1,669.5 $ 1,509.9 $ 1,125.6 621.4  
Amount prior to adoption of ASU 2018-12                
Present value of future profits                
Balance     212.2       249.4 $ 249.4
Deferred acquisition costs                
Balance     1,913.4       1,027.8 1,027.8
Reinsurance receivables                
Balance             4,584.3  
Market risk benefit asset                
Market risk benefit asset     0.0       0.0 0.0
Income tax assets, net                
Balance     1,165.5       199.4 199.4
Policyholder account balances                
Balance     14,858.3       12,540.6 12,540.6
Future policy benefits                
Future policy benefits     11,809.1       11,744.2 11,744.2
Market risk benefit liability                
Market risk benefit liability     0.0       0.0 0.0
Liability for policy and contract claims                
Balance             561.8  
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity     1,400.8 1,297.9       $ 5,484.2
Amount prior to adoption of ASU 2018-12 | Accumulated other comprehensive income (loss)                
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity             2,186.1  
Amount prior to adoption of ASU 2018-12 | Retained earnings                
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity             752.3  
Effect of adoption                
Present value of future profits                
Balance     (8.5)          
Unwinding amounts related to unrealized gains (losses)             10.2  
Deferred acquisition costs                
Balance     (142.5)          
Unwinding amounts related to unrealized gains (losses)             458.0  
Reinsurance receivables                
Changes in measurement of assets             (81.6)  
Change in discount rates             225.7  
Market risk benefit asset                
Market risk benefit asset     65.3          
Changes in market benefit reserve basis             2.5  
Income tax assets, net                
Balance     (102.1)          
Tax impacts of changes recognized in accumulated other comprehensive income             570.3  
Tax impacts of changes recognized in retained earnings             36.7  
Policyholder account balances                
Balance     375.9          
Changes in classification of liabilities             (172.9)  
Future policy benefits                
Future policy benefits     (568.9)          
Unwinding amounts related to unrealized gains (losses)             (197.5)  
Changes in remeasurement of future policy benefits             31.1  
Changes in classification of liabilities             643.0  
Reclass to market risk benefit liability             (66.6)  
Change in discount rates             3,550.7  
Market risk benefit liability                
Market risk benefit liability     11.3          
Reclass to market risk benefit liability             66.6  
Changes in market risk benefit reserve basis             48.2  
Liability for policy and contract claims                
Changes in classification of liabilities             (470.1)  
Statement of Stockholders' Equity [Abstract]                
Total shareholders' equity     $ 368.0 $ 565.5        
Effect of adoption | Accumulated other comprehensive income (loss)                
Statement of Stockholders' Equity [Abstract]                
Unwinding amounts related to unrealized gains (losses)             665.7  
Changes in measurement of assets and liabilities             0.0  
Change in market risk benefit reserve basis             9.2  
Tax impacts of changes recognized in retained earnings             0.0  
Change in discount rates             (3,325.0)  
Tax impacts of changes recognized in accumulated other comprehensive income             570.3  
Effect of adoption | Retained earnings                
Statement of Stockholders' Equity [Abstract]                
Unwinding amounts related to unrealized gains (losses)             0.0  
Changes in measurement of assets and liabilities             (112.7)  
Change in market risk benefit reserve basis             (54.9)  
Tax impacts of changes recognized in retained earnings             36.7  
Change in discount rates             0.0  
Tax impacts of changes recognized in accumulated other comprehensive income             $ 0.0