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Share-based Compensation (Other than Options Award Activity) (Schedules) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
PSUs      
Weighted average grant-date fair value per share      
Granted (in dollars per shares) $ 23.60 $ 26.59 $ 33.97
PSUs | Class A      
Number of shares      
Outstanding at beginning of period (in shares) 1,934,795    
Granted (in shares) 1,177,392    
Forfeited (in shares) (206,110)    
Released from restrictions (in shares) (1,433)    
Outstanding at end of period (in shares) 2,904,644 1,934,795  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 31.00    
Granted (in dollars per shares) 24.01    
Forfeited (in dollars per share) 30.20    
Released from restrictions (in dollars per shares) 37.45    
Outstanding at end of period (in dollars per shares) $ 28.22 $ 31.00  
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 2 months 12 days    
PSUs | Class C      
Number of shares      
Outstanding at beginning of period (in shares) 3,875,732    
Granted (in shares) 2,354,784    
Forfeited (in shares) (413,213)    
Released from restrictions (in shares) (2,866)    
Outstanding at end of period (in shares) 5,814,437 3,875,732  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 30.01    
Granted (in dollars per shares) 23.39    
Forfeited (in dollars per share) 29.21    
Released from restrictions (in dollars per shares) 36.32    
Outstanding at end of period (in dollars per shares) $ 27.39 $ 30.01  
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 2 months 12 days    
RSUs      
Weighted average grant-date fair value per share      
Granted (in dollars per shares) $ 28.72 $ 31.24 $ 36.67
RSUs | Class A      
Number of shares      
Outstanding at beginning of period (in shares) 511,061    
Granted (in shares) 370,355    
Forfeited (in shares) (59,319)    
Released from restrictions (in shares) (239,723)    
Outstanding at end of period (in shares) 582,374 511,061  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 35.81    
Granted (in dollars per shares) 29.36    
Forfeited (in dollars per share) 35.04    
Released from restrictions (in dollars per shares) 35.66    
Outstanding at end of period (in dollars per shares) $ 31.85 $ 35.81  
Weighted average remaining contractual term, in years      
Outstanding at end of period 2 years 4 months 24 days    
RSUs | Class C      
Number of shares      
Outstanding at beginning of period (in shares) 1,007,313    
Granted (in shares) 740,710    
Forfeited (in shares) (118,764)    
Released from restrictions (in shares) (466,908)    
Outstanding at end of period (in shares) 1,162,351 1,007,313  
Weighted average grant-date fair value per share      
Outstanding at beginning of period (in dollars per shares) $ 34.60    
Granted (in dollars per shares) 28.40    
Forfeited (in dollars per share) 28.17    
Released from restrictions (in dollars per shares) 35.33    
Outstanding at end of period (in dollars per shares) $ 31.02 $ 34.60  
Weighted average remaining contractual term, in years      
Outstanding at end of period 2 years 4 months 24 days    
Former Employees | PSUs | Class A      
Number of shares      
Outstanding at end of period (in shares) 172,429    
Weighted average grant-date fair value per share      
Outstanding at end of period (in dollars per shares) $ 30.29    
Weighted average remaining contractual term, in years      
Outstanding at end of period 24 days    
Former Employees | PSUs | Class C      
Number of shares      
Outstanding at end of period (in shares) 345,210    
Weighted average grant-date fair value per share      
Outstanding at end of period (in dollars per shares) $ 29.32    
Weighted average remaining contractual term, in years      
Outstanding at end of period 24 days    
Former Employees | RSUs | Class A      
Number of shares      
Outstanding at end of period (in shares) 9,426    
Weighted average grant-date fair value per share      
Outstanding at end of period (in dollars per shares) $ 36.73    
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 4 months 24 days    
Former Employees | RSUs | Class C      
Number of shares      
Outstanding at end of period (in shares) 18,882    
Weighted average grant-date fair value per share      
Outstanding at end of period (in dollars per shares) $ 36.44    
Weighted average remaining contractual term, in years      
Outstanding at end of period 1 year 4 months 24 days