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Common Stock and Related Matters - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 01, 2017
Jan. 26, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
May 09, 2017
Securities Financing Transaction [Line Items]            
Issuance of common stock (in shares) 17,000,000 9,200,000        
Shares issued price $ 46.10 $ 57.65        
Proceeds from issuance of common stock $ 777,300,000 $ 524,200,000 $ 1,573,400,000 $ 181,200,000    
Warrants exercised (in shares)     0   19,983,843  
Shares of Common Stock [Member]            
Securities Financing Transaction [Line Items]            
Issuance of common stock (in shares)     30,721,000 5,106,000    
Exercise of warrants - share settled (in shares)         11,336,856  
Series A Warrants [Member]            
Securities Financing Transaction [Line Items]            
Exercisable warrants outstanding     67,392      
Series B Warrants [Member]            
Securities Financing Transaction [Line Items]            
Exercisable warrants outstanding     32,496      
Equity Distribution Agreement December 2016 [Member]            
Securities Financing Transaction [Line Items]            
Issuance of common stock (in shares)     4,521,310      
Proceeds from issuance of common stock     $ 257,200,000      
Remaining amount of common stock available under equity distribution agreement     $ 411,200,000      
Equity Distribution Agreement May 2017 [Member]            
Securities Financing Transaction [Line Items]            
Issuance of common stock (in shares)     0      
Amount of common stock authorized under equity distribution agreement           $ 750,000,000