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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 06, 2023 | Nov. 02, 2023 | Sep. 05, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Dividends [Abstract] |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  | $ 0.410 |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  | $ 0.410 |  | $ 0.301 |  | $ 0.793 | $ 0.577
Cash dividend |  |  | $ 222.7 | $ 222.7 | $ 208.9 | $ 166.1 | $ 153.0 |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  | $ 0.439 |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Cash dividend | $ 238.0 |  |  |  |  |  |  |  |

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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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