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Debt - Settlement of debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  | $ 1,000.0 | $ 0.0
Value of Shares Issued |  |  | $ 399.2 | $ 768.7 | $ 651.5 |  |
Loss on settlement of debt |  |  | $ (85.2) | $ (45.1) |  | $ (85.5) | $ (71.9)
3.922% 2021 Notes | Senior Indebtedness |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal Amount Settled |  | $ 1,000.0 |  |  |  |  |
Cash Paid |  | 1,000.0 |  |  |  |  |
Total |  | 1,000.0 |  |  |  |  |
Loss on settlement of debt |  | $ 0.3 |  |  |  |  |
2015 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal Amount Settled | $ 70.4 |  |  |  |  |  |
Cash Paid | 70.4 |  |  |  |  |  |
Value of Shares Issued | 159.9 |  |  |  |  |  |
Total | 230.3 |  |  |  |  |  |
Fair Value Settled | 71.0 |  |  |  |  |  |
Equity Component | 158.9 |  |  |  |  |  |
Loss on settlement of debt | 10.6 |  |  |  |  |  |
2017 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal Amount Settled | 100.7 |  |  |  |  |  |
Cash Paid | 100.7 |  |  |  |  |  |
Value of Shares Issued | 123.5 |  |  |  |  |  |
Total | 224.2 |  |  |  |  |  |
Fair Value Settled | 100.0 |  |  |  |  |  |
Equity Component | 113.0 |  |  |  |  |  |
Loss on settlement of debt | 31.5 |  |  |  |  |  |
2017 Junior Convertible Debt | Junior Convertible Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal Amount Settled | 92.5 |  |  |  |  |  |
Cash Paid | 92.5 |  |  |  |  |  |
Value of Shares Issued | 115.8 |  |  |  |  |  |
Total | 208.3 |  |  |  |  |  |
Fair Value Settled | 87.7 |  |  |  |  |  |
Equity Component | 116.6 |  |  |  |  |  |
Loss on settlement of debt | $ 43.1 |  |  |  |  |  |
0.983% 2024 Notes | Senior Indebtedness |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, redemption price (percent) |  |  |  |  |  | 101.00% |

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