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Debt - Settlement of debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Aug. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cash Paid |  |  |  |  |  |  |  |  | $ 1,000.0 | $ 0.0
Value of Shares Issued |  |  |  | $ 196.9 | $ 399.2 | $ 1,160.1 | $ 768.7 | $ 651.5 |  |
Net Loss on Inducements and Settlements |  |  |  | $ 16.1 |  | $ 142.1 |  |  | $ 101.6 | $ 214.0
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements | $ 0.6 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
2017 Senior Convertible Debt | Senior Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal Amount Settled | 39.7 | 100.7 |  |  |  |  |  |  |  |
Cash Paid | 39.7 | 100.7 |  |  |  |  |  |  |  |
Value of Shares Issued | 61.4 | 123.5 |  |  |  |  |  |  |  |
Total | 101.1 | 224.2 |  |  |  |  |  |  |  |
Fair Value Settled | 37.4 | 100.0 |  |  |  |  |  |  |  |
Equity Component | 63.0 | 113.0 |  |  |  |  |  |  |  |
Net Loss on Inducements and Settlements | 6.3 | 31.5 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
0.983% 2024 Notes | Senior Indebtedness |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price (percent) |  |  |  |  |  |  |  |  | 101.00% |

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