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Debt - Summary of Conversion Features (Details) shares in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) shares | May 31, 2020 USD ($) | Mar. 31, 2020 USD ($) shares | Jun. 30, 2020 USD ($) day | Jun. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
If-converted value in excess of principal |  |  |  | $ 1,000 |
Gain (loss) on settlement of debt | $ (21,500,000) |  |  | (26,800,000) | $ (1,900,000)
Shares issued to settle convertible debt |  |  |  | $ 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 7 months 6 days |
Extinguishment of debt, principal amount | 643,900,000 |  |  |  |
2017 Senior Convertible Debt | Long-term Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt, amount | $ 643,900,000 |  |  |  |
Shares issued to settle convertible debt (in shares) | shares | 2.5 |  |  |  |
Shares issued to settle convertible debt | $ 246,400,000 |  |  |  |
Total consideration, extinguishment of debt | 890,300,000 |  |  |  |
Total consideration, extinguishment of debt, liability component | 481,000,000.0 |  |  |  |
Total consideration, extinguishment of debt, equity component | 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 7 months 6 days |
Extinguishment of debt, principal amount | 383,300,000 |  | $ 615,000,000.0 |  |
2015 Senior Convertible Debt | Long-term Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt, amount | $ 383,300,000 |  | $ 615,000,000.0 |  |
Shares issued to settle convertible debt (in shares) | shares | 4.1 |  | 5.2 |  |
Shares issued to settle convertible debt | $ 405,100,000 |  | $ 351,800,000 |  |
Total consideration, extinguishment of debt | 788,400,000 |  | $ 966,800,000 |  |
Total consideration, extinguishment of debt, liability component | 314,400,000 |  |  |  |
Total consideration, extinguishment of debt, equity component | $ 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 7 months 6 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 |  |  |
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 |  |  |
Secured bridge agreement term |  | 364 days | 364 days |  |
Gain (loss) on settlement of debt |  | $ (5,300,000) |  |  |

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