Acquisition and Joint Venture Transactions (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Jun. 30, 2016	May 16, 2016	Feb. 11, 2016	Dec. 31, 2015	Jun. 03, 2015
Business Acquisition [Line Items]
Goodwill	$ 32,462.0			$ 27,020.4
CWC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 210.8
Other current assets		712.0
Property and equipment, net		2,895.7
Goodwill		5,606.5
Intangible assets subject to amortization, net		1,266.3
Other assets, net		428.0
Current portion of debt and capital lease obligations		(94.4)
Other accrued and current liabilities		(761.0)
Long-term debt and capital lease obligations		(3,280.8)
Other long-term liabilities		(847.4)
Noncontrolling interests		(1,451.8)
Total purchase price		$ 4,683.9
BASE [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 160.1
Other current assets			176.2
Property and equipment, net			785.8
Goodwill			345.9
Other assets, net			10.7
Other accrued and current liabilities			(311.8)
Other long-term liabilities			(97.9)
Total purchase price			1,497.7
Choice Acquisition [Member]
Business Acquisition [Line Items]
Cash and cash equivalents					$ 3.6
Other current assets					7.8
Property and equipment, net					79.8
Goodwill					51.6
Intangible assets subject to amortization, net					59.1
Franchise rights					147.8
Other assets, net					0.3
Other accrued and current liabilities					(13.2)
Non-current deferred tax liabilities					(60.4)
Total purchase price					$ 276.4
Mobile Spectrum [Member] | BASE [Member]
Business Acquisition [Line Items]
Intangible assets subject to amortization, net			261.0
Customer Relationships [Member] | BASE [Member]
Business Acquisition [Line Items]
Intangible assets subject to amortization, net			127.0
Trademarks [Member] | BASE [Member]
Business Acquisition [Line Items]
Intangible assets subject to amortization, net			$ 40.7