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Equity Items - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 08, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Sep. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 01, 2022
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase During Period Value |  | $ 155 |  |  |  |  |  |  |  |
Aggregate amount of common stock to be repurchased |  |  |  |  |  |  |  |  |  | $ 200
Stock Repurchased And Retired During Period Shares |  | 1,700,000 |  |  |  |  |  |  |  |
Common shares repurchased |  |  |  |  | 2,403,380 |  |  |  | 2,403,380 |
Dividend per common share |  |  |  |  | $ 0.30 | $ 0.30 | $ 0.275 | $ 0.275 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchased And Retired During Period Shares | 2,150,000 |  |  |  |  |  |  |  |  |
2021 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase During Period Value |  |  |  | $ 450 |  |  |  |  |  |
Stock Repurchased And Retired During Period Shares |  |  |  | 3,900,000 |  |  |  |  | 4,600,000 |
Common shares repurchased |  |  | 700,000 |  |  |  |  |  |  |

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