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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Amortized Cost Basis by Year of Origination and Credit Quality Indicator The following table summarizes the amortized cost basis by year of origination and credit quality indicator as of March 31, 2020 (in millions):
20202019201820172016PriorNet Investment
Credit Rating:
High$27.0  $52.2  $20.4  $10.9  $3.3  $3.0  $116.8  
Moderate27.3  37.7  25.3  10.6  5.2  0.3  106.4  
Low4.1  1.2  2.0  1.1  1.9  0.1  10.4  
Total$58.4  $91.1  $47.7  $22.6  $10.4  $3.4  $233.6