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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Feb. 04, 2021 | Dec. 04, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  | $ 0.3685 |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  | $ 0.3685 |  |  | $ 0.3665 |  |  | $ 1.1040 | $ 1.0980
Cash dividend |  | $ 96.0 | $ 96.0 | $ 95.3 | $ 90.4 | $ 87.7 | $ 87.3 | $ 87.1 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.39 |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividend | $ 105.0 |  |  |  |  |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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