Restructuring Liability (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended				3 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Employee severance and termination [Member]	Jun. 30, 2014 Office closures [Member]	Jun. 30, 2014 Contract termination and other [Member]	Mar. 31, 2014 Telenet [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of January 1, 2014	$ 113.5	$ 26.6	$ 14.9	$ 72.0
Restructuring charges	123.7	24.9	8.5	90.3	86.1
Cash paid	(61.3)	(33.3)	(8.4)	(19.6)
Foreign currency translation adjustments and other	(2.6)	1.4	0.2	(4.2)
Restructuring liability as of June 30, 2014	173.3	19.6	15.2	138.5
Current portion	58.8	19.5	13.7	25.6
Noncurrent portion	114.5	0.1	1.5	112.9
Total	$ 173.3	$ 19.6	$ 15.2	$ 138.5