Segment Reporting (Revenue by Major Category) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 4,497.2	$ 4,276.5	$ 13,633.1	$ 10,006.2
Video [Member]
Segment Reporting Information [Line Items]
Total revenue	1,600.6	1,599.6	4,903.3	4,087.1
Broadband Internet [Member]
Segment Reporting Information [Line Items]
Total revenue	1,172.0	1,023.7	3,502.1	2,448.2
Telephony [Member]
Segment Reporting Information [Line Items]
Total revenue	795.1	768.5	2,447.9	1,696.6
Cable Subscription [Member]
Segment Reporting Information [Line Items]
Total revenue	3,567.7	3,391.8	10,853.3	8,231.9
Mobile [Member]
Segment Reporting Information [Line Items]
Total revenue	281.6	244.7	812.0	417.2
Total Subscription [Member]
Segment Reporting Information [Line Items]
Total revenue	3,849.3	3,636.5	11,665.3	8,649.1
Business to Business [Member]
Segment Reporting Information [Line Items]
Total revenue	379.8	343.7	1,129.8	629.9
Other Category [Member]
Segment Reporting Information [Line Items]
Total revenue	268.1	296.3	838.0	727.2
Mobile Interconnect [Member]
Segment Reporting Information [Line Items]
Total revenue	60.4	56.3	184.2	113.0
SOHO Cable Subscription [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 50.3	$ 37.9	$ 146.5	$ 106.0