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Stockholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Sep. 18, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity Offering Shares       34,500,000
Common stock, shares authorized 300,000,000 300,000,000    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 91.80%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 729,680      
Stock or Unit Option Plan Expense $ 8.6   $ 7.2  
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures $ (13.9)      
Granted (in shares) 67,500      
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01    
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 5,600,000 16,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 5,700,000      
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.39   $ 2.23  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 15.03   $ 4.55