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Convertible Senior Notes - Narrative - Convertible Senior Notes (Details) - Convertible Senior Notes
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
day
$ / shares
Mar. 31, 2016
Jun. 30, 2015
USD ($)
$ / shares
Debt Instrument [Line Items]      
Initial purchaser's discount $ 23,000,000   $ 23,000,000
Debt issuance costs 500,000   $ 500,000
Net proceeds from issuance of convertible senior notes $ 896,500,000    
Conversion price | $ / shares $ 60.76   $ 60.76
Threshold note trading days | day 5    
Threshold consecutive note trading days 5 days    
Threshold percentage of note price trigger 98.00%    
Redemption price, percentage 100.00%    
Redemption price triggered by fundamental change, percentage 100.00%    
Remaining discount and issuance cost, weighted average amortization period   5 years  
Conversion ratio     0.0164572
Subsequent to September 30, 2015      
Debt Instrument [Line Items]      
Threshold trading days | day 20    
Threshold consecutive trading days 30 days    
Threshold percentage of stock price trigger 130.00%    
Series A Notes      
Debt Instrument [Line Items]      
Principal amount $ 460,000,000   $ 460,000,000
Interest rate 1.00%   1.00%
Series B Notes      
Debt Instrument [Line Items]      
Principal amount $ 460,000,000   $ 460,000,000
Interest rate 1.625%   1.625%
Series B Notes | On or after June 1, 2020 until June 1, 2022      
Debt Instrument [Line Items]      
Threshold trading days | day 20    
Threshold consecutive trading days 30 days    
Threshold percentage of stock price trigger 130.00%    
Series B Notes | On or after June 1, 2020 until June 1, 2022 | Maximum      
Debt Instrument [Line Items]      
Required trading days since notice of redemption 3 days    
Debt, Liability Component      
Debt Instrument [Line Items]      
Initial purchaser's discount $ 17,600,000   $ 17,600,000
Debt issuance costs 400,000   400,000
Debt, Equity Component      
Debt Instrument [Line Items]      
Initial purchaser's discount 5,400,000   5,400,000
Debt issuance costs $ 100,000   $ 100,000