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Stockholders' Equity (Summary Of Restricted Stock Activity) (Details) (Class A Common Stock [Member], USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Minimum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Stock Units to Class A Common Stock, Conversion Ratio 0.5
Maximum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Stock Units to Class A Common Stock, Conversion Ratio 3.0
Performance Stock Unit [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Outstanding, Number of Shares 400,000
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate Intrinsic Value 1,064.8
Fair value of restricted stock-based awards, vested 199.9
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Outstanding, Weighted-Average Grant Date Fair Value (per share) 72.74
Outstanding, Number of Shares 9,540,000
Granted, Weighted-Average Grant Date Fair Value (per share) 106.17
Granted, Number of Shares 5,052,000
Vested, Weighted-Average Grant Date Fair Value (per share) 66.85
Vested, Number of Shares (2,148,000)
Forfeited, Weighted-Average Grant Date Fair Value (per share) 74.39
Forfeited, Number of Shares (748,000)
Outstanding, Weighted-Average Grant Date Fair Value (per share) 88.61
Outstanding, Number of Shares 11,696,000