Goodwill And Other Intangibles (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 77.0	$ 88.5	$ 251.0	$ 333.9
Frontier Legacy Properties [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense				11.3
Customer Base [Member] | Residential Customer List [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			9 years
Customer Base [Member] | Business Customer List [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			12 years
Software Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense				$ 38.3