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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