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Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 1,120.4 | $ 705.5
Commercial paper |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 338.7 | 231.2
Overnight reverse repurchase agreements |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 97.0 | 0.0
Money market funds |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 405.7 | 279.5
Short-term debt securities |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 279.0 | $ 194.8

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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