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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | $ 1,292.5
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Commercial Paper |  | 118.7
Total assets measured at fair value | $ 464.2 | 2,196.6
Corporate bonds and debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 542.9
Time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | 2.2 | 11.5
Government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 723.2
Government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Government agency bonds |  | 20.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Commercial Paper |  | 0.0
Total assets measured at fair value | 15.1 | 123.8
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Government agency bonds |  | 0.0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Commercial Paper |  | 118.7
Total assets measured at fair value | 449.1 | 2,072.8
Significant Other Observable Inputs (Level 2) | Government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Government agency bonds |  | 20.0
Cash and cash equivalents: | Money market mutual funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 12.8 | 121.0
Cash and cash equivalents: | Deposit accounts | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 446.9 | 641.6
Cash and cash equivalents: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Money market mutual funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 12.8 | 121.0
Cash and cash equivalents: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Deposit accounts | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 0.0 | 0.0
Cash and cash equivalents: | Significant Other Observable Inputs (Level 2) | Money market mutual funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 0.0 | 0.0
Cash and cash equivalents: | Significant Other Observable Inputs (Level 2) | Deposit accounts | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 446.9 | 641.6
Short-term investments: | Marketable equity securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | 2.3 | 2.8
Short-term investments: | Corporate bonds and debt | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 542.9
Short-term investments: | Time deposits | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | 2.2 | 11.5
Short-term investments: | Government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 723.2
Short-term investments: | Municipal bonds - taxable | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 14.9
Short-term investments: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable equity securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | 2.3 | 2.8
Short-term investments: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Corporate bonds and debt | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0.0
Short-term investments: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Time deposits | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | 0.0 | 0.0
Short-term investments: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0.0
Short-term investments: | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Municipal bonds - taxable | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0.0
Short-term investments: | Significant Other Observable Inputs (Level 2) | Marketable equity securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | 0.0 | 0.0
Short-term investments: | Significant Other Observable Inputs (Level 2) | Corporate bonds and debt | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 542.9
Short-term investments: | Significant Other Observable Inputs (Level 2) | Time deposits | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | $ 2.2 | 11.5
Short-term investments: | Significant Other Observable Inputs (Level 2) | Government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 723.2
Short-term investments: | Significant Other Observable Inputs (Level 2) | Municipal bonds - taxable | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | $ 14.9

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References No definition available. + Details
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- Definition Unsecured short-term debt instrument issued by corporations which are 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. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3052-108585 + Details
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