XML 47 R36.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments (Tables) | 9 Months Ended
--- | ---
Dec. 31, 2018
Investments [Abstract] |
Schedule of available-for-sale debt securities | The following is a summary of available-for-sale debt securities at March 31, 2018 (in millions):
| Available-for-sale Debt Securities
| Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available-for-sale debt securities: |  |  |  |  |  |  |
Government agency bonds | $ | 723.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 723.2 |
Municipal bonds - taxable | 14.9 |  |  | — |  |  | — |  |  | 14.9 |
Time deposits | 11.5 |  |  | — |  |  | — |  |  | 11.5 |
Corporate bonds and debt | 542.9 |  |  | — |  |  | — |  |  | 542.9 |
Total | $ | 1,292.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,292.5 |
The following is a summary of available-for-sale debt securities at December 31, 2018 (in millions):
| Available-for-sale Debt Securities
| Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Time deposits | $ | 2.3 |  |  | — |  |  | — |  |  | $ | 2.3 |
Schedule of investments classified by contractual maturity date | The amortized cost and estimated fair value of the available-for-sale debt securities at December 31, 2018, by contractual maturity are shown below (in millions). Expected maturities can differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties, and the Company views its available-for-sale debt securities as available for current operations.
| Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available-for-sale debt securities |  |  |  |  |  |  |
Due in one year or less | $ | 2.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.3 |

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration