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Subsequent Events (Details) - U.S. Cellular Term loan facility - USD ($) $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Dec. 31, 2016
Subsequent Events
Debt Instrument Frequency Of Periodic Payment		quarterly
Expected event
Subsequent Events
Debt Instrument Periodic Payment			$ 2.8
Subsequent event
Subsequent Events
Proceeds from Term Loan borrowings	$ 225.0

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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Amount of the required periodic payments including both interest and principal payments.

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- Definition

The cash inflow from bank borrowing during the year.

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