v3.3.1.900
Segment Reporting (Revenue by Major Category) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Principal Transaction Revenue [Line Items]                      
Revenue $ 4,615.2 $ 4,497.2 $ 4,602.2 $ 4,533.7 $ 4,468.0 $ 4,276.5 $ 3,057.8 $ 2,671.9 $ 18,248.3 $ 14,474.2 $ 9,930.8
Video [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 6,544.0 5,724.1 4,637.6
Broadband Internet [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 4,724.6 3,538.7 2,407.0
Fixed-line telephony [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 3,261.4 2,508.5 1,518.9
Cable Subscription [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 14,530.0 11,771.3 8,563.5
SOHO Cable Subscription [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 204.1 152.5 59.7
Mobile Subscription[Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 1,085.6 669.9 131.5
Mobile Interconnect [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 245.0 175.2 35.1
Total Subscription [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 15,615.6 12,441.2 8,695.0
Business to Business [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 1,517.9 986.9 467.9
Other [Member]                      
Principal Transaction Revenue [Line Items]                      
Revenue                 $ 1,114.8 $ 1,046.1 $ 767.9