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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 24, 2019 | Nov. 26, 2018
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 100.0 | $ 200.0
Stock Repurchased During Period, Shares | 24,400,000 | 5,400,000 |  |  |
Payments for Repurchase of Common Stock | $ 252.9 | $ 47.5 | $ 0.0 |  |
Net proceeds from issuance of common shares | $ 0.0 | $ 0.0 | $ 661.3 |  |
Preferred Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued | 0 |  |  |  |
Preferred Stock, Shares Outstanding | 0 |  |  |  |
Preferred Stock, Shares Authorized | 3,000,000 |  |  |  |
Preferred Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued | 0 |  |  |  |
Preferred Stock, Shares Outstanding | 0 |  |  |  |
Preferred Stock, Shares Authorized | 4,000,000 |  |  |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 24,400,000 | 5,400,000 |  |  |
Common Stock, New Shares, Issued |  |  | 63,300,000 |  |
Common stock, shares issued, price per share |  |  | $ 10.75 |  |

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