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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized debt issuance expense | $ 34.2 | $ 38.3
Fair Value | 2017 Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 2,459.2 | 2,106.2
Fair Value | 2015 Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 3,079.1 | 2,481.7
Fair Value | 2017 Junior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 876.9 | 586.6
Fair Value | 2007 Junior Subordinated Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 0.0 | 445.1
Carrying Amount | 2017 Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 1,437.6 | 1,384.9
Carrying Amount | 2015 Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 1,309.9 | 1,261.8
Carrying Amount | 2017 Junior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | 326.7 | 262.3
Carrying Amount | 2007 Junior Subordinated Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for Subordinated Convertible Debentures | $ 0.0 | $ 50.0

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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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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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