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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of carrying amounts and fair values of subordinated convertible debentures | 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 Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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