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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
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 $ 6.8 $ 6.8 $ 7.2
Commission, interest on debt and investment products and fees 2.3 2.4 $ 2.7
Dai-ichi Life      
Related party transactions      
Dividends paid to parent company 140.0 143.8  
PLICO      
Related party transactions      
Guarantee of synthetic lease financing 75.0    
Payment of Management Fee | Dai-ichi Life      
Related party transactions      
Management fee $ 12.2 $ 10.9