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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes, Earnings per Share and Unit and Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes      
Net tax basis in the entity's assets $ 6,113.5 $ 4,384.1  
Percentage of distributions characterized as ordinary income dividends 92.6365%    
Percentage of distributions characterized as capital gain dividends 7.3635%    
Federal excise tax rate (as a percent) 4.00%    
Percentage of ordinary income considered for the calculation of annual amount which is subject to federal excise tax 85.00%    
Percentage of net capital gain considered for the calculation of annual amount which is subject to Federal excise tax 95.00%    
Percentage of prior year taxable income considered for the calculation of annual amount which is subject to federal excise tax 100.00%    
Sales and Excise Tax Payable $ 0.0 0.0 $ 0.0
Net deferred tax liability $ 0.7    
Net deferred tax assets   $ 0.4  
Earnings per Share and Unit      
Potential dilutive securities included in the calculation of diluted earnings per share (in shares) 1,176,000 796,000 702,000
Foreign currency      
Derivatives outstanding $ 0.0 $ 0.0  
Impairment 0.0 $ 0.0 $ 0.0
Equity method investment, difference between carrying amount and underlying equity $ 33.6