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Capital Management - Summary of Dividends Declared or Paid (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 29, 2022 | Dec. 17, 2021 | Apr. 30, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Dividends [Abstract] |  |  |  |  |  |
Interim ordinary dividend to shareholders (in dollars per share) | $ 0.30 | $ 0.40 | $ 0.70 |  |  |
Dividends | $ 129.6 | $ 174.1 | $ 309.9 | $ 129.6 | $ 484.0 | $ 0.0

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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