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Debt - Settlement of debt (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2024 | Sep. 30, 2023 | Aug. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Aug. 31, 2022 | May 31, 2022 | Feb. 28, 2022 | Dec. 31, 2021 | Aug. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400.0 | $ 0.0 | $ 1,000.0
Shares issued to settle convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 670.7
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.2 | $ 8.3 | $ 113.4
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to equity, strike price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 116.79 |  |  |
Line of Credit | Long-term Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  |  | $ 0.6 |  |  |  |  |  |
2015 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  | $ 5.6 | $ 22.0 |  |  | 36.6 | $ 70.4 |  |  |  |  |
Cash Paid |  |  |  |  | 18.9 | 67.7 |  |  | 36.6 | 70.4 |  |  |  |  |
Shares issued to settle convertible debt |  |  |  |  |  |  |  |  | 103.9 | 159.9 |  |  |  |  |
Total consideration |  |  |  |  | 18.9 | 67.7 |  |  | 140.5 | 230.3 |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  | 0.4 | 1.3 |  |  | 4.1 | 10.6 |  |  |  |  |
Fair Value Settled |  |  |  |  |  |  |  |  | 36.2 | 71.0 |  |  |  |  |
Equity Component |  |  |  |  |  |  |  |  | 104.2 | 158.9 |  |  |  |  |
2017 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  | $ 18.2 |  | 25.9 | 14.9 | $ 31.0 | $ 64.9 | 39.7 | 100.7 |  |  |  |  |
Cash Paid |  |  | 42.7 |  | 56.3 | 29.2 | 65.3 | 64.9 | 39.7 | 100.7 |  |  |  |  |
Shares issued to settle convertible debt |  |  |  |  |  |  |  | 74.6 | 61.4 | 123.5 |  |  |  |  |
Total consideration |  |  | 42.7 |  | 56.3 | 29.2 | 65.3 | 139.5 | 101.1 | 224.2 |  |  |  |  |
Net Loss on Inducements and Settlements |  |  | $ 3.1 |  | 6.6 | $ 0.8 | 5.9 | 11.8 | 6.3 | 31.5 |  |  |  |  |
Fair Value Settled |  |  |  |  |  |  |  | 60.0 | 37.4 | 100.0 |  |  |  |  |
Equity Component |  |  |  |  |  |  |  | $ 75.5 | 63.0 | 113.0 |  |  |  |  |
2017 Junior Convertible Debt | Junior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  | 6.5 |  | 3.6 |  | 19.9 | 92.5 |  |  |  |  |
Cash Paid |  |  |  |  | 14.9 |  | 8.2 |  | 19.9 | 92.5 |  |  |  |  |
Shares issued to settle convertible debt |  |  |  |  |  |  |  |  | 31.6 | 115.8 |  |  |  |  |
Total consideration |  |  |  |  | 14.9 |  | 8.2 |  | 51.5 | 208.3 |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  | $ 2.1 |  | $ 0.3 |  | 5.1 | 43.1 |  |  |  |  |
Fair Value Settled |  |  |  |  |  |  |  |  | 15.7 | 87.7 |  |  |  |  |
Equity Component |  |  |  |  |  |  |  |  | $ 35.9 | $ 116.6 |  |  |  |  |
2020 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capped options indexed to equity, costs |  |  |  |  |  |  |  |  |  |  |  | $ 35.8 |  |  |
4.333% 2023 Notes | Senior Indebtedness | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  | $ 1,000.0 |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  | 1,000.0 |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | 1,000.0 |  |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  | $ 0.0 |  |  |  |  |  |  |  |  |  |  |
2.670% 2023 Notes | Senior Indebtedness | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  | $ 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  | 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |
0.972% 2024 Notes | Senior Indebtedness | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled | $ 1,400.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid | 1,400.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | 1,400.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
3.922% 2021 Notes | Senior Indebtedness | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  |  |  |  |  |  |  | $ 1,000.0 |  |  |  |
Cash Paid |  |  |  |  |  |  |  |  |  |  | 1,000.0 |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  | 1,000.0 |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  |  |  |  | $ 0.3 |  |  |  |

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