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v3.20.2

Debt - Summary of Conversion Features (Details) shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 31, 2020 USD ($) shares | Jun. 30, 2020 USD ($) shares | Mar. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) day | Sep. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
If-converted value in excess of principal |  |  |  |  |  |  | $ 1,000 |
Gain (loss) on settlement of debt | $ (45,100,000) | $ (21,500,000) |  | $ (45,100,000) |  | $ (100,000) | $ (71,900,000) | $ (2,000,000.0)
Shares issued to settle convertible debt |  |  |  | $ 768,700,000 | $ 651,500,000 |  |  |
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) |  |  |  |  |  |  | 6 years 4 months 24 days |
Extinguishment of debt, principal amount | 381,800,000 | 643,900,000 |  |  |  |  |  |
2017 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt, amount | $ 381,800,000 | $ 643,900,000 |  |  |  |  |  |
Shares issued to settle convertible debt (in shares) | shares | 2.1 | 2.5 |  |  |  |  |  |
Shares issued to settle convertible debt | $ 221,100,000 | $ 246,400,000 |  |  |  |  |  |
Total consideration, extinguishment of debt | 602,900,000 | 890,300,000 |  |  |  |  |  |
Total consideration, extinguishment of debt, liability component | 299,000,000.0 | 481,000,000.0 |  |  |  |  |  |
Total consideration, extinguishment of debt, equity component | 292,200,000 | 390,900,000 |  |  |  |  |  |
2015 Senior Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  | 130.00% |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  | 4 years 4 months 24 days |
Extinguishment of debt, principal amount | 414,300,000 | 383,300,000 | $ 615,000,000.0 |  |  |  |  |
2015 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt, amount | $ 414,300,000 | $ 383,300,000 | $ 615,000,000.0 |  |  |  |  |
Shares issued to settle convertible debt (in shares) | shares | 5.2 | 4.1 | 5.2 |  |  |  |  |
Shares issued to settle convertible debt | $ 547,600,000 | $ 405,100,000 | $ 351,800,000 |  |  |  |  |
Total consideration, extinguishment of debt | 961,800,000 | 788,400,000 | $ 966,800,000 |  |  |  |  |
Total consideration, extinguishment of debt, liability component | 351,700,000 | 314,400,000 |  |  |  |  |  |
Total consideration, extinguishment of debt, equity component | $ 592,300,000 | 464,400,000 |  |  |  |  |  |
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) |  |  |  |  |  |  | 16 years 4 months 24 days |
Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price (percent) |  |  |  |  |  |  | 100.00% |
Convertible Debt | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  | 130.00% |
Threshold trading days | day |  |  |  |  |  |  | 20 |
Threshold consecutive trading days | day |  |  |  |  |  |  | 30 |
Convertible Debt | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  | 98.00% |
Threshold trading days | day |  |  |  |  |  |  | 5 |
Threshold consecutive trading days | day |  |  |  |  |  |  | 10 |
Senior Indebtedness | 2017 Senior Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 643,900,000 |  |  | $ 643,900,000 |  |  |
Senior Indebtedness | 2015 Senior Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  | 383,300,000 |  |  |  |  |  |
Bridge Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  | 615,000,000.0 |  |  |  |  |  |
Gain (loss) on settlement of debt |  | $ (5,300,000) |  |  |  |  |  |

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