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Convertible Senior Notes (Details)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2013
USD ($)
shares
day
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Convertible Notes Payable [Abstract]        
Contractual interest rate - Notes 0.00%      
Notes, par value $ 575,000,000 $ 575,000,000   $ 575,000,000
Converted number of shares | shares 7.8      
Conversion rate (in USD per share) 13.54      
Conversion of notes, base conversion price $ 1,000      
Initial conversion price (in USD per share) | $ / shares $ 73.88      
Terms of conversion feature Jul. 01, 2018      
Earliest date of conversion Mar. 31, 2014      
Number of days out of 30 that common stock price exceeded conversion price, days | day 20      
Debt Conversion [Line Items]        
Number of consecutive trading days in a period 30 days      
Percentage of purchase price of Notes which should be paid upon fundamental change 100.00%      
Fair value of Notes   $ 681,400,000   741,800,000
Fair value measurement debt basis amount       $ 100
Remaining life of the Notes   22 months    
Note hedged shares of common stock covered | shares 7.8      
Purchase of convertible note hedge     $ 135,800,000  
Issuance of warrants (in shares) | shares 7.8      
Exercise price of warrants issued (in USD per share) | $ / shares $ 107.46      
Proceeds from issuance of warrants $ 84,500,000      
Measurement period [Member]        
Debt Conversion [Line Items]        
Number of consecutive trading days in a period 5 days      
Debt instrument, convertible, threshold trading days 5 days      
Minimum | Calendar quarter end [Member]        
Debt Conversion [Line Items]        
Threshold percentage of stock price trigger 130.00%      
Maximum | Measurement period [Member]        
Debt Conversion [Line Items]        
Threshold percentage of stock price trigger 98.00%