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STOCKHOLDERS' EQUITY - Capital Stock (Details) - At-The-Market Equity Offering Program - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Equity offering [Line Items] |  |  |
Common stock authorized under equity offering program |  |  | $ 1,000.0
Stock issued during period, shares, new issues, equity offering program |  | 0.8 |
Shares Issued, Price Per Share |  | $ 45.07 |
Equity offering program, remaining authorized offering amount |  | $ 785.0 |
Subsequent Event |  |  |
Equity offering [Line Items] |  |  |
Stock issued during period, shares, new issues, equity offering program | 0.7 |  |
Shares Issued, Price Per Share | $ 44.65 |  |

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