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Earnings per Share - Computation of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]            
Net Income $ 79.6 $ 98.8 $ 107.9 $ 105.3 $ 178.4 $ 213.2
Number of Basic Shares Outstanding (in share) 57,797,841   57,797,841   57,797,841 57,797,841
Number of Diluted Shares Outstanding (in share) 57,797,841   57,797,841   57,797,841 57,797,841
Earnings per share - basic (in dollars per share) $ 1.38   $ 1.87   $ 3.09 $ 3.69
Earnings per share - diluted (in dollars per share) $ 1.38   $ 1.87   $ 3.09 $ 3.69