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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Derivatives, Taxes and Earnings (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Income taxes    
Provision for U.S. federal income taxes $ 0.0 $ 0.0
Interest rate swap    
Accounting for derivative instruments    
Notional amount $ 300.0  
Fixed interest rate paid (as a percent) 2.04%