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Debt - Settlement of debt (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
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Aug. 31, 2022 | May 31, 2022 | Feb. 28, 2022 | Dec. 31, 2021 | Aug. 31, 2021 | Jun. 30, 2021 | Feb. 28, 2021 | Dec. 31, 2020 | Aug. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  |  |  |  |  |  | $ 0.0 | $ 1,000.0 | $ 0.0
Value of Shares Issued |  |  |  |  |  |  |  |  |  |  |  | 670.7 | 3,171.1
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  |  |  |  | 8.3 | 113.4 | 299.6
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  | 10.4 | 124.6 |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to equity, strike price (in dollars per share) |  |  |  |  |  |  |  | $ 116.79 |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  |  |  |  | $ 1,086.5 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings on revolving loan under credit facility |  |  |  |  |  |  |  | 213.0 |  |  | 5,935.0 | 4,176.0 | $ 3,966.0
Line of Credit | Revolving Credit Facility | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  | $ 0.6 |  |  |  |  |  |  |  |  |
Line of Credit | Term Loan Facility | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  |  |  |  | 1,705.7 |  | $ 17.8 |  |  |
Cash Paid |  |  |  |  |  |  |  | 1,705.7 |  | 17.8 |  |  |
Total |  |  |  |  |  |  |  | 1,705.7 |  | 17.8 |  |  |
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  | 12.9 |  |  |  |  |
Bridge Loan Facility | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  |  |  |  |  |  | 615.0 |  |  |
Cash Paid |  |  |  |  |  |  |  |  |  | 615.0 |  |  |
Total |  |  |  |  |  |  |  |  |  | 615.0 |  |  |
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  |  |  | 5.3 |  |  |
2015 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  | 0.0 | 3.7 |
2015 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled | $ 22.0 |  |  | 36.6 | $ 70.4 |  | $ 81.0 | 90.0 | $ 414.3 | 383.3 |  |  |
Cash Paid | 67.7 |  |  | 36.6 | 70.4 |  | 81.0 | 48.5 | 414.3 | 383.3 |  |  |
Value of Shares Issued |  |  |  | 103.9 | 159.9 |  | 206.5 | 221.0 | 547.6 | 405.1 |  |  |
Total | 67.7 |  |  | 140.5 | 230.3 |  | 287.5 | 269.5 | 961.9 | 788.4 |  |  |
Fair Value Settled |  |  |  | 36.2 | 71.0 |  | 79.2 | 79.4 | 351.7 | 314.4 |  |  |
Equity Component |  |  |  | 104.2 | 158.9 |  | 208.1 | 184.5 | 592.3 | 464.4 |  |  |
Net Loss on Inducements and Settlements | 1.3 |  |  | 4.1 | 10.6 |  | 10.7 | 9.4 | 25.0 | 7.8 |  |  |
2017 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  | 0.0 | 23.4 |
2017 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled | 14.9 | $ 31.0 | $ 64.9 | 39.7 | 100.7 |  | 122.2 | 588.8 | 381.8 | 643.9 |  |  |
Cash Paid | 29.2 | 65.3 | 64.9 | 39.7 | 100.7 |  | 122.2 | 155.4 | 381.8 | 643.9 |  |  |
Value of Shares Issued |  |  | 74.6 | 61.4 | 123.5 |  | 166.4 | 408.7 | 221.1 | 246.4 |  |  |
Total | 29.2 | 65.3 | 139.5 | 101.1 | 224.2 |  | 288.6 | 1,165.6 | 602.9 | 890.3 |  |  |
Fair Value Settled |  |  | 60.0 | 37.4 | 100.0 |  | 115.9 | 486.7 | 299.0 | 481.0 |  |  |
Equity Component |  |  | 75.5 | 63.0 | 113.0 |  | 168.2 | 655.3 | 292.2 | 390.9 |  |  |
Net Loss on Inducements and Settlements | $ 0.8 | 5.9 | $ 11.8 | 6.3 | 31.5 |  | 25.5 | 57.0 | $ 20.1 | $ 13.7 |  |  |
2017 Junior Convertible Debt | Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  | 0.0 | 4.7 |
2017 Junior Convertible Debt | Junior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  | 3.6 |  | 19.9 | 92.5 |  | 156.0 | 407.7 |  |  |  |  |
Cash Paid |  | 8.2 |  | 19.9 | 92.5 |  | 156.0 | 225.0 |  |  |  |  |
Value of Shares Issued |  |  |  | 31.6 | 115.8 |  | 217.9 | 530.4 |  |  |  |  |
Total |  | 8.2 |  | 51.5 | 208.3 |  | 373.9 | 819.4 |  |  |  |  |
Fair Value Settled |  |  |  | 15.7 | 87.7 |  | 129.8 | 246.3 |  |  |  |  |
Equity Component |  |  |  | 35.9 | 116.6 |  | 243.9 | 547.1 |  |  |  |  |
Net Loss on Inducements and Settlements |  | $ 0.3 |  | $ 5.1 | $ 43.1 |  | $ 49.4 | 62.8 |  |  |  |  |
2020 Senior Convertible Debt | 2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument amount |  |  |  |  |  |  |  | 601.5 |  |  |  |  |
2020 Senior Convertible Debt | 2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument amount |  |  |  |  |  |  |  | 64.0 |  |  |  |  |
2020 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument amount |  |  |  |  |  |  |  | 665.5 |  |  |  |  |
2020 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, including equity portion, gross |  |  |  |  |  |  |  | 10.8 |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  | 0.0 | 75.3 |
Capped options indexed to equity, costs |  |  |  |  |  |  |  | $ 35.8 |  |  |  |  |
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 |  |  |  |  |  | 1,000.0 |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  |  | $ 0.3 |  |  |  |  |  |  |
0.972% 2024 Notes | Senior Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | 1,400.0 |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  |  |  | $ 1.2 | $ 2.5 |

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