Restructuring Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Restructuring liability as of January 1, 2014	$ 113.5
Restructuring charges	99.6
Cash paid	(30.1)
Foreign currency translation adjustments and other	(3.4)
Restructuring liability as of March 31, 2014	179.6
Current portion	61.4
Noncurrent portion	118.2
Total	179.6
Employee severance and termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of January 1, 2014	26.6
Restructuring charges	12.0
Cash paid	(18.4)
Foreign currency translation adjustments and other	(0.1)
Restructuring liability as of March 31, 2014	20.1
Current portion	20.0
Noncurrent portion	0.1
Total	20.1
Office closures [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of January 1, 2014	14.9
Restructuring charges	0.5
Cash paid	(5.7)
Foreign currency translation adjustments and other	0
Restructuring liability as of March 31, 2014	9.7
Current portion	8.1
Noncurrent portion	1.6
Total	9.7
Contract termination and other [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of January 1, 2014	72.0
Restructuring charges	87.1
Cash paid	(6.0)
Foreign currency translation adjustments and other	(3.3)
Restructuring liability as of March 31, 2014	149.8
Current portion	33.3
Noncurrent portion	116.5
Total	149.8
Telenet [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 86.1