v3.26.1
Consolidated Statement of Changes in Shareholders' Equity - USD ($)
Total
Common shares
Treasury shares
Additional paid-in capital
Retained earnings
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Treasury shares (in shares)     (16,300,000)      
Common shares, issued (in shares) at Sep. 30, 2024   65,200,000        
Treasury shares (in shares) at Sep. 30, 2024     16,300,000      
Shareholders' equity at Sep. 30, 2024 $ 1,584,100,000 $ 700,000 $ (937,900,000) $ 1,586,000,000 $ 1,090,100,000 $ (154,800,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (2,100,000)       (2,100,000)  
Dividends, Common Stock, Cash (7,100,000)       (7,100,000)  
Foreign currency translation adjustments (48,300,000)         (48,300,000)
Pension and postretirement activity 400,000         400,000
Deferred loss on hedging activity 5,000,000.0         5,000,000.0
Treasury Stock, Shares, Acquired     (800,000)      
Repurchase of shares (in usd) (30,100,000)   $ (30,100,000)      
Activity under share plans (in usd) 900,000   $ (23,300,000)      
Common shares, issued (in shares) at Dec. 31, 2024   65,200,000        
Treasury shares (in shares) at Dec. 31, 2024     16,800,000      
Shareholders' equity at Dec. 31, 2024 1,501,000,000 $ 700,000 $ (944,700,000) 1,561,800,000 1,080,900,000 (197,700,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     300,000      
Adjustments to Additional Paid in Capital, Other       (24,200,000)    
Common shares, issued (in shares) at Sep. 30, 2024   65,200,000        
Treasury shares (in shares) at Sep. 30, 2024     16,300,000      
Shareholders' equity at Sep. 30, 2024 1,584,100,000 $ 700,000 $ (937,900,000) 1,586,000,000 1,090,100,000 (154,800,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 56,000,000.0          
Foreign currency translation adjustments 28,200,000          
Pension and postretirement activity 1,200,000          
Deferred loss on hedging activity (1,500,000)          
Common shares, issued (in shares) at Jun. 30, 2025   65,200,000        
Treasury shares (in shares) at Jun. 30, 2025     18,800,000      
Shareholders' equity at Jun. 30, 2025 1,568,000,000 $ 700,000 $ (1,003,700,000) 1,573,500,000 1,124,400,000 (126,900,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Treasury shares (in shares)     (16,800,000)      
Common shares, issued (in shares) at Dec. 31, 2024   65,200,000        
Treasury shares (in shares) at Dec. 31, 2024     16,800,000      
Shareholders' equity at Dec. 31, 2024 1,501,000,000 $ 700,000 $ (944,700,000) 1,561,800,000 1,080,900,000 (197,700,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) 29,000,000.0       29,000,000.0  
Dividends, Common Stock, Cash (7,600,000)       (7,600,000)  
Foreign currency translation adjustments 23,000,000.0         23,000,000.0
Pension and postretirement activity 300,000         300,000
Deferred loss on hedging activity (2,800,000)         (2,800,000)
Treasury Stock, Shares, Acquired     (1,100,000)      
Repurchase of shares (in usd) (35,200,000)   $ (35,200,000)      
Activity under share plans (in usd) (6,200,000)   $ (700,000)      
Common shares, issued (in shares) at Mar. 31, 2025   65,200,000        
Treasury shares (in shares) at Mar. 31, 2025     17,900,000      
Shareholders' equity at Mar. 31, 2025 1,513,900,000 $ 700,000 $ (979,200,000) 1,567,300,000 1,102,300,000 (177,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     0      
Adjustments to Additional Paid in Capital, Other       5,500,000    
Treasury shares (in shares)     (17,900,000)      
Net Income (Loss) 29,100,000       29,100,000  
Dividends, Common Stock, Cash (7,000,000)       (7,000,000.0)  
Foreign currency translation adjustments 53,500,000         53,500,000
Pension and postretirement activity 500,000         500,000
Deferred loss on hedging activity (3,700,000)         (3,700,000)
Treasury Stock, Shares, Acquired     (900,000)      
Repurchase of shares (in usd) (24,600,000)   $ (24,600,000)      
Activity under share plans (in usd) (6,300,000)   $ (100,000)      
Common shares, issued (in shares) at Jun. 30, 2025   65,200,000        
Treasury shares (in shares) at Jun. 30, 2025     18,800,000      
Shareholders' equity at Jun. 30, 2025 $ 1,568,000,000 $ 700,000 $ (1,003,700,000) 1,573,500,000 1,124,400,000 (126,900,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     0      
Adjustments to Additional Paid in Capital, Other       6,200,000    
Treasury shares (in shares)     (18,800,000)      
Treasury shares (in shares) 18,787,745   (18,800,000)      
Common shares, issued (in shares) at Sep. 30, 2025 65,251,989 65,200,000        
Treasury shares (in shares) at Sep. 30, 2025 (18,787,745)   18,800,000      
Shareholders' equity at Sep. 30, 2025 $ 1,553,100,000 $ 700,000 $ (1,003,300,000) 1,578,800,000 1,086,700,000 (109,800,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (65,700,000)       65,700,000  
Dividends, Common Stock, Cash (7,000,000.0)       (7,000,000.0)  
Foreign currency translation adjustments 3,200,000         3,200,000
Pension and postretirement activity 600,000         600,000
Deferred loss on hedging activity 1,500,000         1,500,000
Activity under share plans (in usd)     $ (18,700,000)      
Common shares, issued (in shares) at Dec. 31, 2025   65,200,000        
Treasury shares (in shares) at Dec. 31, 2025     18,500,000      
Shareholders' equity at Dec. 31, 2025 1,486,200,000 $ 700,000 $ (984,600,000) 1,560,600,000 1,014,000,000 (104,500,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     300,000      
Adjustments to Additional Paid in Capital, Other       (18,200,000)    
Activity under share plans $ 500,000          
Common shares, issued (in shares) at Sep. 30, 2025 65,251,989 65,200,000        
Treasury shares (in shares) at Sep. 30, 2025 (18,787,745)   18,800,000      
Shareholders' equity at Sep. 30, 2025 $ 1,553,100,000 $ 700,000 $ (1,003,300,000) 1,578,800,000 1,086,700,000 (109,800,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (62,600,000)          
Dividends, Common Stock, Cash (22,000,000.0)          
Foreign currency translation adjustments (10,400,000)          
Pension and postretirement activity 1,300,000          
Deferred loss on hedging activity $ 3,800,000          
Treasury Stock, Shares, Acquired (700,000)          
Repurchase of shares (in usd) $ (15,100,000)          
Common shares, issued (in shares) at Jun. 30, 2026 65,251,989 65,200,000        
Treasury shares (in shares) at Jun. 30, 2026 (19,170,663)   19,200,000      
Shareholders' equity at Jun. 30, 2026 $ 1,459,900,000 $ 700,000 $ (997,500,000) 1,569,700,000 1,002,100,000 (115,100,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Treasury shares (in shares)     (18,500,000)      
Common shares, issued (in shares) at Dec. 31, 2025   65,200,000        
Treasury shares (in shares) at Dec. 31, 2025     18,500,000      
Shareholders' equity at Dec. 31, 2025 1,486,200,000 $ 700,000 $ (984,600,000) 1,560,600,000 1,014,000,000 (104,500,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (10,600,000)       (10,600,000)  
Dividends, Common Stock, Cash (7,600,000)       (7,600,000)  
Foreign currency translation adjustments (12,000,000.0)         (12,000,000.0)
Pension and postretirement activity 300,000         300,000
Deferred loss on hedging activity 1,200,000         1,200,000
Treasury Stock, Shares, Acquired     (700,000)      
Repurchase of shares (in usd) (15,100,000)   $ (15,100,000)      
Activity under share plans (in usd)     $ (1,900,000)      
Common shares, issued (in shares) at Mar. 31, 2026   65,200,000        
Treasury shares (in shares) at Mar. 31, 2026     19,200,000      
Shareholders' equity at Mar. 31, 2026 1,448,100,000 $ 700,000 $ (997,800,000) 1,564,400,000 995,800,000 (115,000,000.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     0      
Adjustments to Additional Paid in Capital, Other       3,800,000    
Activity under share plans 5,700,000          
Treasury shares (in shares)     (19,200,000)      
Net Income (Loss) 13,700,000       13,700,000  
Dividends, Common Stock, Cash (7,400,000)       (7,400,000)  
Foreign currency translation adjustments (1,600,000)         (1,600,000)
Pension and postretirement activity 400,000         400,000
Deferred loss on hedging activity $ 1,100,000         1,100,000
Activity under share plans (in usd)     $ (300,000)      
Common shares, issued (in shares) at Jun. 30, 2026 65,251,989 65,200,000        
Treasury shares (in shares) at Jun. 30, 2026 (19,170,663)   19,200,000      
Shareholders' equity at Jun. 30, 2026 $ 1,459,900,000 $ 700,000 $ (997,500,000) 1,569,700,000 $ 1,002,100,000 $ (115,100,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     0      
Adjustments to Additional Paid in Capital, Other       $ 5,300,000    
Activity under share plans $ 5,600,000          
Treasury shares (in shares) 19,170,663   (19,200,000)