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Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Feb. 03, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Jan. 26, 2018
Equity [Abstract]          
Share repurchase authorization         10.0
Treasury shares repurchased (in shares)     0.8    
Treasury shares repurchased (in usd)   $ 15.0 $ 30.0 $ 24.5  
Share repurchase authorization, remaining     5.7    
Dividends declared     $ 16.2    
Dividends to common shareholders     $ 16.1 $ 16.7  
Dividends declared (per share) $ 0.15   $ 0.15