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Fair Value Measurements (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents $ 215,400,000 $ 344,600,000  
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 258,500,000 107,100,000  
Fair value, assets, level 1 to level 2 transfers 0   $ 0
Fair value, assets, level 3 transfers 0   $ 0
Fair value of outstanding notes 618,800,000 381,300,000  
Fair Value, Inputs, Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 177,600,000 306,600,000  
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
Fair Value, Inputs, Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 37,800,000 38,000,000  
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 258,500,000 107,100,000  
Fair value of outstanding notes 618,800,000    
Fair Value, Inputs, Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 0 0  
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
U.S. government agencies      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 189,600,000 87,300,000  
U.S. government agencies | Fair Value, Inputs, Level 1      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
U.S. government agencies | Fair Value, Inputs, Level 2      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 189,600,000 87,300,000  
U.S. government agencies | Fair Value, Inputs, Level 3      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
Corporate debt      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 1,000,000 5,100,000  
Corporate debt | Fair Value, Inputs, Level 1      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
Corporate debt | Fair Value, Inputs, Level 2      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 1,000,000 5,100,000  
Corporate debt | Fair Value, Inputs, Level 3      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
Commercial paper      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 67,900,000 14,700,000  
Commercial paper | Fair Value, Inputs, Level 1      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 0  
Commercial paper | Fair Value, Inputs, Level 2      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 67,900,000 14,700,000  
Commercial paper | Fair Value, Inputs, Level 3      
Debt securities, available for sale      
Short-term marketable securities, available-for-sale 0 $ 0  
Equity investment in Tandem Diabetes Care, Inc      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Tandem Diabetes Care, Inc. 42,800,000    
Equity investment in Tandem Diabetes Care, Inc | Fair Value, Inputs, Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Tandem Diabetes Care, Inc. 42,800,000    
Equity investment in Tandem Diabetes Care, Inc | Fair Value, Inputs, Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Tandem Diabetes Care, Inc. 0    
Equity investment in Tandem Diabetes Care, Inc | Fair Value, Inputs, Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Tandem Diabetes Care, Inc. $ 0