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Fair Value Measurements - Fair Value Hierarchy of Financial Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 255.0 | $ 266.0
Equity investment in Tandem Diabetes Care, Inc. |  | 38.0
Debt securities, available for sale: | 1,087.1 | 210.6
Other assets | 0.7 |
Total assets measured at fair value on a recurring basis | 1,342.8 | 514.6
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 110.1 | 199.3
Equity investment in Tandem Diabetes Care, Inc. |  | 38.0
Debt securities, available for sale: | 0.0 | 0.0
Other assets | 0.7 |
Total assets measured at fair value on a recurring basis | 110.8 | 237.3
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 144.9 | 66.7
Equity investment in Tandem Diabetes Care, Inc. |  | 0.0
Debt securities, available for sale: | 1,087.1 | 210.6
Other assets | 0.0 |
Total assets measured at fair value on a recurring basis | 1,232.0 | 277.3
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Equity investment in Tandem Diabetes Care, Inc. |  | 0.0
Debt securities, available for sale: | 0.0 | 0.0
Other assets | 0.0 |
Total assets measured at fair value on a recurring basis | 0.0 | 0.0
U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 676.0 | 173.1
U.S. government agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 0.0 | 0.0
U.S. government agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 676.0 | 173.1
U.S. government agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 0.0 | 0.0
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 248.2 | 36.2
Commercial paper | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 0.0 | 0.0
Commercial paper | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 248.2 | 36.2
Commercial paper | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 0.0 | 0.0
Corporate debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 162.9 | 1.3
Corporate debt | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 0.0 | 0.0
Corporate debt | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | 162.9 | 1.3
Corporate debt | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities, available for sale: | $ 0.0 | $ 0.0

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