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Fair Value Measurements (Tables) | 3 Months Ended
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Jun. 30, 2018
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |
Schedule of fair value, assets and liabilities measured on recurring basis | Assets measured at fair value on a recurring basis at June 30, 2018 are as follows (in millions):
| Quoted Prices in Active Markets for Identical Instruments (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Total Balance
Assets |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |
Money market mutual funds | $ | 46.4 |  |  | $ | — |  |  | $ | 46.4 |
Deposit accounts | — |  |  | 588.8 |  |  | 588.8 |
Short-term investments: |  |  |  |  |
Marketable equity securities | 3.2 |  |  | — |  |  | 3.2 |
Time deposits | — |  |  | 11.3 |  |  | 11.3 |
Total assets measured at fair value | $ | 49.6 |  |  | $ | 600.1 |  |  | $ | 649.7 |
Assets measured at fair value on a recurring basis at March 31, 2018 are as follows (in millions):
| Quoted Prices in Active Markets for Identical Instruments (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Total Balance
Assets |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |
Money market mutual funds | $ | 121.0 |  |  | $ | — |  |  | $ | 121.0 |
Deposit accounts | — |  |  | 641.6 |  |  | 641.6 |
Commercial Paper | — |  |  | 118.7 |  |  | 118.7 |
Government agency bonds | — |  |  | 20.0 |  |  | 20.0 |
Short-term investments: |  |  |  |  |
Marketable equity securities | 2.8 |  |  | — |  |  | 2.8 |
Corporate bonds and debt | — |  |  | 542.9 |  |  | 542.9 |
Time deposits | — |  |  | 11.5 |  |  | 11.5 |
Government agency bonds | — |  |  | 723.2 |  |  | 723.2 |
Municipal bonds - taxable | — |  |  | 14.9 |  |  | 14.9 |
Total assets measured at fair value | $ | 123.8 |  |  | $ | 2,072.8 |  |  | $ | 2,196.6 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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