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Debt - CEC Convertible Notes (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 02, 2019
USD ($)
Oct. 06, 2017
USD ($)
day
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
Debt Instrument [Line Items]        
Converted amount   $ 1.00    
Threshold trading days | day   20    
Threshold consecutive trading days | day   30    
Repayments of convertible debt $ 28,000,000      
Convertible Debt        
Debt Instrument [Line Items]        
Conversion ratio   0.139    
Conversion price (in dollars per share) | $ / shares   $ 7.19    
Potential shares outstanding   17.90%    
Threshold percentage of stock price trigger   140.00%    
Remaining discount amortization period     4 years 9 months  
Unsecured Debt | Convertible Debt        
Debt Instrument [Line Items]        
Face amount   $ 1,100,000,000 $ 1,100,000,000  
Fixed rate   5.00%    
Fair Value, Inputs, Level 3 | Fair Value, Recurring | Convertible Debt        
Debt Instrument [Line Items]        
Conversion price (in dollars per share) | $ / shares     $ 192.55 $ 122.38
Convertible number of shares (in shares) | shares     156  
Parent Company | Fair Value, Inputs, Level 3 | Fair Value, Recurring | Convertible Debt        
Debt Instrument [Line Items]        
Convertible number of shares (in shares) | shares     151