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STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 15, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Statutory Accounting Practices [Line Items]          
Statutory net income   $ 321.1 $ 731.2 $ (391.6)  
Statutory capital and surplus   4,300.0 $ 4,300.0    
Gain on retrocession $ 1,200.0        
Consolidated shareowners' equity which represented net assets of the Company's insurance subsidiaries that is required to be maintained as minimum capital   1,500.0      
Market value of fixed maturity and short-term investments of the company's subsidiaries deposited with regulatory authorities   $ 40.8      
Scenario, Forecast          
Statutory Accounting Practices [Line Items]          
Net assets of the Company's insurance subsidiaries that are restricted from transfer (in dollars)         $ 154.8