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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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Indicates amendment to accounting standards.

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