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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss, Net of Taxes
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Balance, beginning of year (in shares) at Oct. 31, 2017   65,500,000        
Balance, beginning of year at Oct. 31, 2017   $ 0.7 $ 675.2 $ (20.3) $ 720.1  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under employee stock purchase and share-based compensation plans (in shares)   500,000        
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans   $ 0.0 (0.4)      
Share-based compensation expense     17.0      
Repurchase of common stock (in shares) 0 0        
Repurchase of common stock   $ 0.0 0.0      
Other comprehensive (loss) income       11.3    
Net income $ 97.8       97.8  
Dividends            
Common stock ($0.740, $0.720, and $0.700 per share)         (46.0)  
Common stock, dividends (usd per share) $ 0.700          
Stock issued under share-based compensation plans         (0.6)  
Balance, end of year (in shares) at Oct. 31, 2018   66,000,000.0        
Balance, end of year at Oct. 31, 2018 $ 1,454.6 $ 0.7 691.8 (9.0) 771.2  
Dividends            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201409Member          
Stock issued under employee stock purchase and share-based compensation plans (in shares)   600,000        
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans   $ 0.0 (0.3)      
Share-based compensation expense     17.5      
Repurchase of common stock (in shares) 0 0        
Repurchase of common stock   $ 0.0 0.0      
Other comprehensive (loss) income       (14.9)    
Net income $ 127.4       127.4  
Common stock ($0.740, $0.720, and $0.700 per share)         (47.7)  
Common stock, dividends (usd per share) $ 0.720          
Stock issued under share-based compensation plans         (1.0)  
Balance, end of year (in shares) at Oct. 31, 2019   66,600,000        
Balance, end of year at Oct. 31, 2019 $ 1,542.0 $ 0.7 708.9 (23.9) 856.3  
Balance, beginning of year at Jul. 31, 2019           $ 6.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 47.9          
Balance, end of year (in shares) at Oct. 31, 2019   66,600,000        
Balance, end of year at Oct. 31, 2019 $ 1,542.0 $ 0.7 708.9 (23.9) 856.3  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock issued under employee stock purchase and share-based compensation plans (in shares)   300,000        
Stock issued (taxes withheld) under employee stock purchase and share-based compensation plans   $ 0.0 0.0      
Share-based compensation expense     20.3      
Repurchase of common stock (in shares) (200,000) (200,000)        
Repurchase of common stock $ (5.1) $ 0.0 (5.1)      
Other comprehensive (loss) income       (6.9)    
Net income $ 0.3       0.3  
Dividends            
Common stock ($0.740, $0.720, and $0.700 per share)         (49.3)  
Common stock, dividends (usd per share) $ 0.740          
Stock issued under share-based compensation plans         (0.9)  
Balance, end of year (in shares) at Oct. 31, 2020   66,700,000        
Balance, end of year at Oct. 31, 2020 $ 1,500.3 $ 0.7 $ 724.1 $ (30.8) $ 806.4