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Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Jan. 26, 2018
Equity [Abstract]                    
Share repurchase authorization                   10.0
Treasury shares repurchased (in shares)               2.8    
Treasury shares repurchased (in usd) $ 24.6 $ 35.2 $ 30.1   $ 9.9 $ 15.4 $ 15.5      
Dividends declared               $ 21.7    
Dividends to common shareholders               22.4 $ 23.3  
Dividends declared (per share) $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.15          
Dividends declared (per share) $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.15          
us-gaap_TreasuryStockValueAcquiredCostMethodlessexcisetax               $ 90.2    
Share repurchase authorization, remaining 0.2             0.2