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Equity Items - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2019 | May 31, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common shares repurchased |  |  | 0 |  |  |  | 2,236,546 |  |  | 0 | 2,236,546 |
Common Stock, Dividends, Per Share, Paid |  |  | $ 0.275 | $ 0.275 | $ 0.275 | $ 0.275 | $ 0.275 | $ 0.25 | $ 0.25 | $ 0.825 |  |
Percentage of increase in cash dividend |  |  |  |  |  |  |  |  |  | 10.00% |  |
2019 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase During Period Value |  | $ 200 |  |  |  |  |  |  |  |  |  |
Stock Repurchased And Retired During Period Shares |  | 2,200,000 |  |  |  |  |  |  |  |  |  | 2,600,000
Common shares repurchased | 400,000 |  |  |  |  |  |  |  |  | 0 |  |

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