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Share-based Compensation (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 51.4 $ 63.4
Percent of annual incentive compensation receivable in shares 100.00%  
Other operating expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 0.3 1.2
SG&A expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 51.1 62.2
Liberty Global    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 49.1 56.8
Performance-based incentive awards | Liberty Global    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 7.1 24.0
Non-performance based incentive awards | Liberty Global    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 33.0 25.4
Other    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 2.3 6.6
Other | Liberty Global    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 9.0 $ 7.4