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Fair Value of Financial Instruments | 6 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | Fair Value of Financial Instruments The carrying amount of cash equivalents approximates fair value because their maturity is less than three months. Management believes the carrying amount of the equity and cost-method investments materially approximated fair value at September 30, 2018 based upon unobservable inputs. The fair values of these investments have been determined as Level 3 fair value measurements. The fair values of the Company's line of credit borrowings are estimated using discounted cash flow analyses, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements and approximate carrying value excluding debt issuance costs. Based on the borrowing rates currently available to the Company for bank loans with similar terms and average maturities, the fair value of the Company's line of credit borrowings at September 30, 2018 approximated the carrying value and are considered Level 2 in the fair value hierarchy described in Note 8. The carrying amount of accounts receivable, accounts payable and accrued liabilities approximates fair value due to the short-term maturity of the amounts and are considered Level 2 in the fair value hierarchy. Fair Value of Subordinated Convertible Debt, Senior Secured Notes, and Term Loan Facility The Company measures the fair value of its senior and junior subordinated convertible debt and senior secured notes for disclosure purposes. These fair values are based on observable market prices for this debt, which is traded in less active markets and are therefore classified as a Level 2 fair value measurement. The following table shows the carrying amounts and fair values of the Company's senior and junior subordinated convertible debt, senior secured notes, and term loan facility as of September 30, 2018 and March 31, 2018 (in millions).
| September 30, 2018 |  | March 31, 2018
| Carrying Amount (1) |  | Fair Value |  | Carrying Amount (1) |  | Fair Value
2023 Senior Secured Notes | $ | 983.7 |  |  | $ | 987.5 |  |  | $ | — |  |  | $ | — |
2021 Senior Secured Notes | $ | 984.5 |  |  | $ | 994.0 |  |  | $ | — |  |  | $ | — |
Term Loan Facility | $ | 2,703.0 |  |  | $ | 2,733.0 |  |  | $ | — |  |  | $ | — |
2017 Senior Convertible Debt | $ | 1,465.2 |  |  | $ | 2,201.3 |  |  | $ | 1,437.6 |  |  | $ | 2,459.2 |
2015 Senior Convertible Debt | $ | 1,335.0 |  |  | $ | 2,615.5 |  |  | $ | 1,309.9 |  |  | $ | 3,079.1 |
2017 Junior Convertible Debt | $ | 331.2 |  |  | $ | 724.8 |  |  | $ | 326.7 |  |  | $ | 876.9 |
(1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 13. Debt and Credit Facility for further information).

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- Definition The entire disclosure for a company's election to apply the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) the reasons for electing a fair value option for each eligible item or group of similar eligible items; (b) if the fair value option is elected for some but not all eligible items within a group of similar eligible items: (i) a description of those similar items and the reasons for partial election and (ii) information of how the group of similar items relates to individual balance sheet line items; (c) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected: (i) information of how each line item in the statement of financial position relates to major categories of assets and liabilities presented in accordance with other fair value disclosures and (ii) the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (d) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (e) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (f) for investments that would have been accounted for under the equity method if the entity had not chosen to apply the fair value option, the information required for such investments, if material either individually or in the aggregate; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) a description of how interest and dividends are measured and where they are reported in the income statement; (c) for loans and other receivables held as assets: (i) the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk and (ii) how the gains or losses attributable to changes in instrument-specific credit risk were determined; (d) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk: (i) the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk, (ii) qualitative information about the reasons for those changes, and (iii) how the gains and losses attributable to changes in instrument-specific credit risk were determined; and (3) certain other disclosures as required or determined to be provided. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -URI http://asc.fasb.org/topic&trid=2134543 + Details
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