Investment In Cellular Partnership (Schedule Of Equity In Earnings Of Equity Method Investees) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings from Cellular Partnerships, net		$ 11.9		$ 36.9
Earnings from Cellular Partnerships, including gain on sale	265.0		285.2
Transaction costs related to the sale of Convergys' interest in Cellular Partnerships	0	0	(1.2)	0
Net gain on sale of interests in Cellular Partnerships	265.0	0	265.0	0
Cincinnati SMSA Limited Partnership [Member]
Earnings from Cellular Partnerships, net	0	11.6	20.5	36.1
Cincinnati SMSA Tower Holdings LLC [Member]
Earnings from Cellular Partnerships, net	$ 0	$ 0.3	$ 0.9	$ 0.8

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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+ Details