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Fair Value Measurements (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 173,900,000 $ 344,600,000
Short-term marketable securities, available-for-sale 250,800,000 107,100,000
Fair Value, Assets, Level 1 to Level 2 Transfers 0  
Fair Value, Assets, Level 3 Transfers 0  
Fair value of outstanding notes 465,800,000 381,300,000
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 149,000,000 306,600,000
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 24,900,000 38,000,000
Short-term marketable securities, available-for-sale 250,800,000 107,100,000
Fair value of outstanding notes 465,800,000  
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Short-term marketable securities, available-for-sale 0 0
U.S. government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 199,400,000 87,300,000
U.S. government agencies | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 0 0
U.S. government agencies | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 199,400,000 87,300,000
U.S. government agencies | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 0 0
Corporate debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 2,100,000 5,100,000
Corporate debt | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 0 0
Corporate debt | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 2,100,000 5,100,000
Corporate debt | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 0 0
Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 49,300,000 14,700,000
Commercial paper | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 0 0
Commercial paper | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term marketable securities, available-for-sale 49,300,000 14,700,000
Commercial paper | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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]    
Investments, Fair Value Disclosure 55,100,000  
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]    
Investments, Fair Value Disclosure 55,100,000  
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]    
Investments, Fair Value Disclosure 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]    
Investments, Fair Value Disclosure $ 0