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Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2021 | Jul. 12, 2021 | Jun. 18, 2021 | May 18, 2021 | Mar. 19, 2021 | Feb. 11, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) |  | $ 0.20 |  | $ 0.20 |  | $ 0.16 | $ 0.20 | $ 0.16 | $ 0.56 | $ 0.48
Amount of quarterly cash dividend declared |  | $ 30.0 | $ 30.3 |  | $ 24.7 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly cash dividend (in dollars per share) | $ 0.20 |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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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- 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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