Share-based Compensation (Summary of Stock-Based Compensation Not Yet Recognized) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Parent Company [Member] | Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized	$ 150.0
Weighted average period remaining for expense recognition (in years)	2 years 8 months 12 days
Parent Company [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized	197.3
Weighted average period remaining for expense recognition (in years)	1 year 6 months
Telenet [Member] | Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized	$ 5.8
Weighted average period remaining for expense recognition (in years)	2 years 2 months 12 days