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Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 645.1 | $ 2,039.6
Commercial paper |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 71.9 | 31.0
Money market funds |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 519.2 | 741.7
Short-term debt securities |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 54.0 | $ 1,266.9

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