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Fair Value Measurements (Tables) | 12 Months Ended
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Mar. 31, 2018
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | Assets measured at fair value on a recurring basis at March 31, 2018 are as follows (amounts 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 |
Assets measured at fair value on a recurring basis at March 31, 2017 are as follows (amounts 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 | $ | 343.8 |  |  | $ | — |  |  | $ | 343.8 |
Deposit accounts | — |  |  | 564.9 |  |  | 564.9 |
Short-term investments: |  |  |  |  |
Marketable equity securities | 1.6 |  |  | — |  |  | 1.6 |
Corporate bonds and debt | — |  |  | 165.2 |  |  | 165.2 |
Government agency bonds | — |  |  | 162.0 |  |  | 162.0 |
Municipal bonds - tax-exempt | — |  |  | 55.3 |  |  | 55.3 |
Municipal bonds - taxable | — |  |  | 10.0 |  |  | 10.0 |
Long-term Investments: |  |  |  |  |
Corporate bonds and debt | — |  |  | 42.6 |  |  | 42.6 |
Government agency bonds | — |  |  | 64.9 |  |  | 64.9 |
Total assets measured at fair value | $ | 345.4 |  |  | $ | 1,064.9 |  |  | $ | 1,410.3 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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