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Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
May 08, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Jan. 26, 2018
Equity [Abstract]                  
Share repurchase authorization                 10.0
Treasury shares repurchased (in shares)             0.8    
Treasury shares repurchased (in usd)   $ 15.4 $ 15.5   $ 15.0 $ 15.0      
Share repurchase authorization, remaining   3.8         3.8    
Dividends declared             $ 15.2    
Dividends to common shareholders             15.8 $ 16.1  
Dividends declared (per share)   $ 0.15 $ 0.15 $ 0.15          
Dividends declared (per share)   $ 0.15 $ 0.15 $ 0.15          
us-gaap_TreasuryStockValueAcquiredCostMethodlessexcisetax             $ 30.3    
Subsequent Event                  
Equity [Abstract]                  
Dividends declared (per share) $ 0.15                
Dividends declared (per share) $ 0.15