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Long-Term Debt (Narrative) (Description of 1.00% Notes) (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Jun. 08, 2015
USD ($)
Dec. 31, 2016
USD ($)
trading_day
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Debt issuance costs   $ 73,100,000 $ 14,400,000  
Conversion option recorded to equity     107,500,000  
Share repurchased value     348,200,000 $ 121,200,000
Repayments of Long-term Debt   313,800,000 495,500,000 90,600,000
Conversion option, debt discount   (32,900,000)    
Payments for hedge   0 108,900,000 0
Proceeds from issuance of warrants   $ 0 $ 52,000,000 $ 0
1.00% Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate (as a percent)   1.00% 1.00%  
Debt issuance costs   $ 11,300,000 $ 13,900,000  
Convertible Debt [Member] | 1.00% Notes [Member]        
Debt Instrument [Line Items]        
Principal amount of debt $ 690,000,000      
Debt instrument, interest rate (as a percent) 1.00% 1.00%    
Debt issuance costs $ 18,300,000      
Debt issuance costs 15,400,000      
Conversion option recorded to equity 2,900,000      
Share repurchased value     $ 70,000,000  
Repayments of Long-term Debt $ 350,000,000      
Debt instrument, convertible, conversion ratio (in shares)   54.0643    
Debt conversion, original debt amount   $ 1,000    
Conversion price per share (in dollars per share) | $ / shares   $ 18.50    
Redemption price percentage   100.00%    
Conversion option, debt discount   $ 110,400,000    
Effective interest rate (as a percent)   4.29%    
Convertible note hedge   $ 56,900,000    
Exercise price, warrants (in dollars per share) | $ / shares   $ 25.96    
Proceeds from issuance of warrants   $ 52,000,000    
Convertible Debt [Member] | 1.00% Notes [Member] | Embedded Derivative Financial Instruments [Member]        
Debt Instrument [Line Items]        
Conversion price per share (in dollars per share) | $ / shares   $ 18.50    
Number of convertible shares | shares   37.3    
Payments for hedge   $ 108,900,000    
Debt Conversion One [Member] | Convertible Debt [Member] | 1.00% Notes [Member]        
Debt Instrument [Line Items]        
Threshold trading days | trading_day   20    
Threshold consecutive trading days   30 days    
Threshold percentage of stock price trigger (greater than or equal to)   130.00%    
Debt Conversion Two [Member] | Convertible Debt [Member] | 1.00% Notes [Member]        
Debt Instrument [Line Items]        
Threshold consecutive trading days   5 days    
Period immediately following consecutive trading days (in business days)   5 days    
Ratio of trading price per 1000 principal amount (as a percent) (less than)   0.98