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Fair Value of Financial Instruments (Schedule of carrying amounts and fair values) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Carrying Value | 2023 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | $ 982.8 | $ 0.0
Carrying Value | 2021 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 983.1 | 0.0
Carrying Value | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,965.8 | 0.0
Carrying Value | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,451.3 | 1,437.6
Carrying Value | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,322.3 | 1,309.9
Carrying Value | 2017 Junior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 328.9 | 326.7
Estimate of Fair Value Measurement | 2023 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,005.5 | 0.0
Estimate of Fair Value Measurement | 2021 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 1,001.7 | 0.0
Estimate of Fair Value Measurement | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 3,000.0 | 0.0
Estimate of Fair Value Measurement | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 2,416.7 | 2,459.2
Estimate of Fair Value Measurement | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | 3,011.2 | 3,079.1
Estimate of Fair Value Measurement | 2017 Junior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for subordinated convertible debentures | $ 814.2 | $ 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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