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DISCONTINUED OPERATIONS - SALE OF U.S. RETAIL WIRELESS BUSINESS (Details) - Alltel Sale - AT&T Mobility - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 20, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Liabilities sold: |  |  |
Additional gain (loss) on sale of assets |  | $ 1.1 | $ 1.1
Alltel Wireless |  |  |
SALE OF U.S. RETAIL WIRELESS BUSINESS |  |  |
Consideration for sale of operations in all-cash transaction | $ 780.0 |  |
Proceeds: |  |  |
Working capital | $ 16.8 |  |

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