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INVESTMENTS INVESTMENTS - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016
Gain (Loss) on Investments [Line Items] |  |  |  |  |
NumberOfSecuritiesInSecurityPortfolio | 759 |  | 759 |  | 706
NumberOfSecuritiesInUnrealizedLossPosition | 207 |  | 207 |  | 255
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 53.9 | $ 99.4 | $ 179.6 | $ 206.9 |
Available-for-sale Securities, Gross Realized Gains | 0.4 | 0.8 | 1.8 | 1.2 |
Available-for-sale Securities, Gross Realized Losses | $ 0.1 | $ 0.5 | $ 0.2 | $ 1.0 |

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