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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Valuation allowance for deferred tax assets |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Balance at beginning of period | $ 29.4 | $ 10.8
Additions, Charged to costs and expenses | 36.6 | 18.6
Additions, Charged to other accounts | 0.0 | 0.0
(Deductions) | 0.0 | 0.0
Balance at end of period | 66.0 | 29.4
Allowance for premium receivables |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Balance at beginning of period | 0.0 |
Additions, Charged to costs and expenses | 0.9 |
Additions, Charged to other accounts | 0.0 |
(Deductions) | (0.7) |
Balance at end of period | $ 0.2 | $ 0.0

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