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Subsequent Events (Details) - $ / shares |  |  | 3 Months Ended | 9 Months Ended | 10 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 03, 2021 | Oct. 27, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 03, 2021
Subsequent events |  |  |  |  |  |  |
Common stock cash dividends declared, per share (in dollars per share) |  |  | $ 0.49 | $ 0.47 | $ 1.43 | $ 1.41 |
2021 Stock Repurchase Plan |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |
Number of shares repurchased |  |  | 485,491 |  | 1,185,491 |  |
Average price per share |  |  | $ 74.19 |  | $ 81.13 |  |
Subsequent event |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |
Common stock cash dividends declared, per share (in dollars per share) |  | $ 0.49 |  |  |  |  |
Subsequent event | 2021 Stock Repurchase Plan |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |
Number of shares repurchased | 120,072 |  |  |  |  |  | 1,305,563
Average price per share | $ 76.83 |  |  |  |  |  | $ 80.74
Additional shares available for repurchase | 2,200,000 |  |  |  |  |  | 2,200,000

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