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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 03, 2021 | Nov. 02, 2021 | Sep. 03, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  | $ 0.2185 |  |  |  |  |  |
Cash dividend |  |  | $ 121.2 | $ 121.2 | $ 113.1 | $ 95.3 | $ 90.4 |  |
Dividends declared per common share (in dollars per share) |  |  |  | $ 0.2185 |  | $ 0.1840 |  | $ 0.4250 | $ 0.3678
Forecast |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Cash dividend | $ 129.0 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  | $ 0.232 |  |  |  |  |  |  |

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