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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | $ 1,292.5
Total assets measured at fair value | $ 436.2 | 2,196.6
Money market mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 6.7 | 121.0
Deposit accounts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 425.5 | 641.6
Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: |  | 118.7
Government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 723.2
Government agency bonds |  | 20.0
Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value | 1.7 | 2.8
Corporate bonds and debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 542.9
Time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value | 2.3 | 11.5
Municipal bonds - taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 14.9
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets measured at fair value | 8.4 | 123.8
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Money market mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 6.7 | 121.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Deposit accounts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: |  | 0.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 0.0
Government agency bonds |  | 0.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value | 1.7 | 2.8
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Corporate bonds and debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 0.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Municipal bonds - taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 0.0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets measured at fair value | 427.8 | 2,072.8
Significant Other Observable Inputs (Level 2) | Money market mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Deposit accounts |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: | 425.5 | 641.6
Significant Other Observable Inputs (Level 2) | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash and cash equivalents: |  | 118.7
Significant Other Observable Inputs (Level 2) | Government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 723.2
Government agency bonds |  | 20.0
Significant Other Observable Inputs (Level 2) | Marketable equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Corporate bonds and debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | 542.9
Significant Other Observable Inputs (Level 2) | Time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value | $ 2.3 | 11.5
Significant Other Observable Inputs (Level 2) | Municipal bonds - taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Estimated Fair Value |  | $ 14.9

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