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Debt - Settlement of debt (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
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, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  |  |  |  |  | $ 1,000.0 | $ 0.0 | $ 0.0
Value of Shares Issued |  |  |  |  |  |  |  |  |  | 670.7 | 3,171.1 | 351.8
Net Loss on Inducements and Settlements |  |  |  |  |  |  |  |  |  | 113.4 | 299.6 | 5.4
Long-term debt |  |  |  |  |  |  |  |  |  | 7,837.2 | 9,209.4 |
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 Credit Facility |  |  |  |  |  | 213.0 |  |  |  | 4,176.0 | 3,966.0 | 1,026.0
Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Senior Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 6,999.1 | 7,946.6 |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  | $ 0.6 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 1,399.1 | 2,346.6 |
Bridge Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 615.0 |  |  | $ 615.0
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 |  |  |  |
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 |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  | $ 0.3 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 0.0 | 1,000.0 |
2015 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  | $ 81.0 | 90.0 | $ 414.3 | 383.3 | 615.0 |  |  |
Cash Paid |  |  |  |  | 81.0 | 48.5 | 414.3 | 383.3 | 615.0 |  |  |
Value of Shares Issued |  |  |  |  | 206.5 | 221.0 | 547.6 | 405.1 | 351.8 |  |  |
Total |  |  |  |  | 287.5 | 269.5 | 961.9 | 788.4 | 966.8 |  |  |
Fair Value Settled |  |  |  |  | 79.2 | 79.4 | 351.7 | 314.4 | 460.4 |  |  |
Equity Component |  |  |  |  | 208.1 | 184.5 | 592.3 | 464.4 | 461.1 |  |  |
Net Loss on Inducements and Settlements |  |  |  |  | 10.7 | 9.4 | 25.0 | 7.8 | $ 3.4 |  |  |
2015 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  | 36.6 | $ 70.4 |  |  |  |  |  |  |  |  |
Cash Paid |  | 36.6 | 70.4 |  |  |  |  |  |  |  |  |
Value of Shares Issued |  | 103.9 | 159.9 |  |  |  |  |  |  |  |  |
Total |  | 140.5 | 230.3 |  |  |  |  |  |  |  |  |
Fair Value Settled |  | 36.2 | 71.0 |  |  |  |  |  |  |  |  |
Equity Component |  | 104.2 | 158.9 |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  | 4.1 | 10.6 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 34.4 | 141.4 |
2017 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  | 122.2 | 588.8 | 381.8 | 643.9 |  |  |  |
Cash Paid |  |  |  |  | 122.2 | 155.4 | 381.8 | 643.9 |  |  |  |
Value of Shares Issued |  |  |  |  | 166.4 | 408.7 | 221.1 | 246.4 |  |  |  |
Total |  |  |  |  | 288.6 | 1,165.6 | 602.9 | 890.3 |  |  |  |
Fair Value Settled |  |  |  |  | 115.9 | 486.7 | 299.0 | 481.0 |  |  |  |
Equity Component |  |  |  |  | 168.2 | 655.3 | 292.2 | 390.9 |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  | 25.5 | 57.0 | $ 20.1 | $ 13.7 |  |  |  |
2017 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled | $ 64.9 | 39.7 | 100.7 |  |  |  |  |  |  |  |  |
Cash Paid | 64.9 | 39.7 | 100.7 |  |  |  |  |  |  |  |  |
Value of Shares Issued | 74.6 | 61.4 | 123.5 |  |  |  |  |  |  |  |  |
Total | 139.5 | 101.1 | 224.2 |  |  |  |  |  |  |  |  |
Fair Value Settled | 60.0 | 37.4 | 100.0 |  |  |  |  |  |  |  |  |
Equity Component | 75.5 | 63.0 | 113.0 |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements | $ 11.8 | 6.3 | 31.5 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 128.1 | 333.3 |
2017 Junior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  |  |  |  | 156.0 | 407.7 |  |  |  |  |  |
Cash Paid |  |  |  |  | 156.0 | 225.0 |  |  |  |  |  |
Value of Shares Issued |  |  |  |  | 217.9 | 530.4 |  |  |  |  |  |
Total |  |  |  |  | 373.9 | 819.4 |  |  |  |  |  |
Fair Value Settled |  |  |  |  | 129.8 | 246.3 |  |  |  |  |  |
Equity Component |  |  |  |  | 243.9 | 547.1 |  |  |  |  |  |
Net Loss on Inducements and Settlements |  |  |  |  | $ 49.4 | 62.8 |  |  |  |  |  |
2017 Junior Convertible Debt | Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Settled |  | 19.9 | 92.5 |  |  |  |  |  |  |  |  |
Cash Paid |  | 19.9 | 92.5 |  |  |  |  |  |  |  |  |
Value of Shares Issued |  | 31.6 | 115.8 |  |  |  |  |  |  |  |  |
Total |  | 51.5 | 208.3 |  |  |  |  |  |  |  |  |
Fair Value Settled |  | 15.7 | 87.7 |  |  |  |  |  |  |  |  |
Equity Component |  | 35.9 | 116.6 |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements |  | $ 5.1 | $ 43.1 |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 10.1 | 122.6 |
0.983% 2024 Notes | Senior Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 1,000.0 | 0.0 |
2020 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument amount |  |  |  |  |  | 665.5 |  |  |  |  |  |
2020 Senior Convertible Debt | Long-term Debt | 2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument amount |  |  |  |  |  | 601.5 |  |  |  |  |  |
2020 Senior Convertible Debt | Long-term Debt | 2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument amount |  |  |  |  |  | $ 64.0 |  |  |  |  |  |
2020 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 665.5 | 665.5 |
0.972% 2024 Notes | Senior Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | 1,400.0 |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 1,400.0 | $ 1,400.0 |

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