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DISCONTINUED OPERATIONS - SALE OF U.S. RETAIL WIRELESS BUSINESS (Details) - Alltel Sale - Discontinued Operations, Disposed of by Sale - USD ($) $ in Millions |  | 12 Months Ended
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Sep. 20, 2013 | Dec. 31, 2015
SALE OF U.S. RETAIL WIRELESS BUSINESS |  |
Consideration for sale of operations | $ 780.0 |
Working capital | $ 16.8 |
Additional gain (loss) on sale of assets |  | $ 1.1

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