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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | 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 | $ 983.7 | $ 0.0
Carrying amount | 2021 Senior Secured Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 984.5 | 0.0
Carrying amount | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,703.0 | 0.0
Carrying amount | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,465.2 | 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 | 1,335.0 | 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 | 331.2 | 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 | 987.5 | 0.0
Fair Value | 2021 Senior Secured Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 994.0 | 0.0
Fair Value | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,733.0 | 0.0
Fair Value | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,201.3 | 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 | 2,615.5 | 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 | $ 724.8 | $ 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/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 Reference 2: 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 + 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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