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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Certain corporations with which the Company's directors were affiliated        
Related party transactions        
Premiums and policy fees or other amounts for insurance and investment products, interest on bonds and commissions on securities underwriting   $ 45.3 $ 6.8 $ 7.2
Commission, interest on debt and investment products and fees   $ 10.0 6.5 8.6
Dai-ichi Life        
Related party transactions        
Dividends paid to parent company     143.8 89.3
PLICO        
Related party transactions        
Guarantee of synthetic lease financing     75.0  
Predecessor | Certain corporations with which the Company's directors were affiliated        
Related party transactions        
Premiums and policy fees or other amounts for insurance and investment products, interest on bonds and commissions on securities underwriting $ 2.6      
Commission, interest on debt and investment products and fees $ 0.8      
Payment of Management Fee | Dai-ichi Life        
Related party transactions        
Management fee     $ 10.9 $ 6.4