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INVESTMENTS INVESTMENTS - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016
Gain (Loss) on Investments [Line Items] |  |  |  |  |
NumberOfSecuritiesInSecurityPortfolio | 761 |  | 761 |  | 706
NumberOfSecuritiesInUnrealizedLossPosition | 197 |  | 197 |  | 255
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 103.4 | $ 64.8 | $ 125.6 | $ 107.5 |
Available-for-sale Securities, Gross Realized Gains | 1.0 | 0.0 | 1.5 | 0.3 |
Available-for-sale Securities, Gross Realized Losses | $ 0.1 | $ 0.2 | $ 0.1 | $ 0.5 |

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