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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018
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Carrying Amount | 2023 Senior Secured Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | $ 985.4 |
Carrying Amount | 2021 Senior Secured Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 987.4 |
Carrying Amount | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,892.1 |
Carrying Amount | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,493.6 | $ 1,437.6
Carrying Amount | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,360.8 | 1,309.9
Carrying Amount | 2017 Junior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 335.9 | 326.7
Fair Value | 2023 Senior Secured Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,020.1 |
Fair Value | 2021 Senior Secured Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,008.1 |
Fair Value | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,911.5 |
Fair Value | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,285.4 | 2,459.2
Fair Value | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,810.6 | 3,079.1
Fair Value | 2017 Junior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | $ 740.8 | $ 876.9

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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