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Debt and Credit Facility - Amortization and Interest Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |
Debt issuance amortization | $ 16.5 | $ 6.6 | $ 4.5
Debt discount amortization | 114.6 | 106.1 | 56.1
Other interest expense | 2.9 | 2.4 | 0.8
Total interest expense | 502.9 | 199.0 | 146.3
Senior Secured Indebtedness |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuance amortization | 12.9 | 3.1 | 2.4
Debt discount amortization | 2.2 | 0.0 | 0.0
Interest expense | 291.8 | 6.6 | 40.4
Total interest expense on Senior Secured Indebtedness | 306.9 | 9.7 | 42.8
Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuance amortization | 3.6 | 3.5 | 2.1
Debt discount amortization | 112.4 | 106.1 | 56.1
Interest expense | 77.1 | 77.3 | 44.5
Total interest expense on Senior Secured Indebtedness | $ 193.1 | $ 186.9 | $ 102.7
2017 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) | 7 years 10 months 17 days |  |
2015 Senior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) | 5 years 10 months 17 days |  |
2017 Junior Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) | 17 years 10 months 17 days |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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