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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
	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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