v3.25.1
Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Jan. 26, 2018
Equity [Abstract]                
Share repurchase authorization               10.0
Treasury shares repurchased (in shares)           1.9    
Treasury shares repurchased (in usd) $ 35.2 $ 30.1   $ 15.4 $ 15.5      
Share repurchase authorization, remaining 1.1         1.1    
Dividends declared           $ 14.7    
Dividends to common shareholders           15.2 $ 15.8  
Dividends declared (per share) $ 0.15 $ 0.15 $ 0.15          
Dividends declared (per share) $ 0.15 $ 0.15 $ 0.15          
us-gaap_TreasuryStockValueAcquiredCostMethodlessexcisetax           $ 65.7