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Significant Accounting Policies - ASU 2020-06 (Details) - USD ($) $ in Millions | Apr. 01, 2022 | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ 4,175.2 | $ 3,393.5
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2020-06 Retrospective |  |
Forecast | Accounting Standards Update 2020-06 Retrospective | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Additional Paid in Capital | $ 133.6 |  |
Retained earnings | 52.0 |  |
Forecast | Accounting Standards Update 2020-06 Retrospective | Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase in debt instrument | 105.8 |  |
Convertible debt, interest expense decrease | $ 32.7 |  |

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