Investment In Cellular Partnership (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Proceeds from sale of interests in the Cellular Partnerships	$ 320
Net gain on sale of interests in Cellular Partnerships	265.0
Net gain on sale of interest in Cellular Partnerships, net of tax	$ 171.8
Cincinnati SMSA Limited Partnership [Member]
Percentage of interest owned by company	33.80%
Cincinnati SMSA Tower Holdings LLC [Member]
Percentage of interest owned by company	45.00%
AT&T [Member] | Cincinnati SMSA Limited Partnership [Member]
Percentage of interest owned by company	66.00%
AT&T [Member] | Cincinnati SMSA Tower Holdings LLC [Member]
Percentage of interest owned by company	53.00%