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Shareholders' Equity - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 14 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | May 07, 2019
Stockholders Equity Note [Abstract] |  |  |  |  |
Number of shares of common stock authorized for buyback (in shares) |  |  |  |  | 10,000,000
Number of additional shares of common stock authorized for buyback (in shares) |  |  |  |  | 8,637,179
Remaining number of shares authorized to be repurchased (in shares) |  | 7,459,328 |  | 7,459,328 | 1,362,821
Treasury stock, shares, acquired (in shares) |  | 550,853 | 4,043,627 | 2,540,672 |
Treasury stock, value, acquired, cost method | $ 88.9 | $ 40.8 | $ 283.9 |  |

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