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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Common Stock [Member] |  |
Other Significant Noncash Transactions [Line Items] |  |
Other Significant Noncash Transaction, Value of Consideration Given | $ 617.6 | $ 0.0
Share-based Payment Arrangement [Member] |  |
Other Significant Noncash Transactions [Line Items] |  |
Other Significant Noncash Transaction, Value of Consideration Given | $ 3.9 | $ 0.0

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