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Consolidated Statement of Changes in Stockholders’ Equity - USD ($)
$ in Millions
Total
Class A Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Treasury Stock At Cost [Member]
Balance at May. 31, 2012 $ 830.3 $ 0.0 $ 0.4 $ 583.0 $ (74.2) $ 723.9 $ (402.8)
Balance (in Shares) at May. 31, 2012   1,700,000.0 29,800,000.0        
Net Income (loss) 31.1         31.1  
Foreign currency translation adjustment (2.6)       (2.6)    
Pension and postretirement adjustments, net of tax 11.4       11.4    
Stock-based compensation 7.3     7.3      
Proceeds from issuance of common stock pursuant to stock-based compensation plans 14.7     14.7      
Proceeds from issuance of common stock pursuant to stock-based compensation (in Shares)     500,000.0        
Purchases of treasury stock at cost (11.8)           (11.8)
Purchases of treasury stock at cost (in Shares)     (400,000.0)        
Treasury stock issued pursuant to stock purchase plans 0.1     (22.1)     22.2
Treasury stock issued pursuant to stock purchase plans (in Shares)     200,000.0        
Dividends (16.1)         (16.1)  
Balance at May. 31, 2013 864.4 $ 0.0 $ 0.4 582.9 (65.4) 738.9 (392.4)
Balance (in Shares) at May. 31, 2013   1,700,000 30,100,000.0        
Net Income (loss) 44.4         44.4  
Foreign currency translation adjustment (3.1)       (3.1)    
Pension and postretirement adjustments, net of tax 13.3       13.3    
Stock-based compensation 9.3     9.3      
Proceeds from issuance of common stock pursuant to stock-based compensation plans 12.9     12.9      
Proceeds from issuance of common stock pursuant to stock-based compensation (in Shares)     500,000.0        
Purchases of treasury stock at cost (6.2)           (6.2)
Purchases of treasury stock at cost (in Shares)     (200,000.0)        
Treasury stock issued pursuant to stock purchase plans (1.4)     (24.3)     22.9
Treasury stock issued pursuant to stock purchase plans (in Shares)     200,000.0        
Dividends (18.2)         (18.2)  
Balance at May. 31, 2014 915.4 $ 0.0 $ 0.4 580.8 (55.2) 765.1 (375.7)
Balance (in Shares) at May. 31, 2014   1,700,000 30,600,000.0        
Net Income (loss) 294.6         294.6  
Foreign currency translation adjustment (15.3)       (15.3)    
Pension and postretirement adjustments, net of tax (6.5)       (6.5)    
Stock-based compensation 11.3     11.3      
Proceeds from issuance of common stock pursuant to stock-based compensation plans 28.1     28.1      
Proceeds from issuance of common stock pursuant to stock-based compensation (in Shares)     900,000.0        
Purchases of treasury stock at cost $ (3.5)           (3.5)
Purchases of treasury stock at cost (in Shares) (100,000)   (100,000.0)        
Treasury stock issued pursuant to stock purchase plans $ 0.6     (28.7)     29.3
Treasury stock issued pursuant to stock purchase plans (in Shares)     100,000.0        
Dividends (19.8)         (19.8)  
Balance at May. 31, 2015 $ 1,204.9 $ 0.0 $ 0.4 $ 591.5 $ (77.0) $ 1,039.9 $ (349.9)
Balance (in Shares) at May. 31, 2015   1,700,000 31,500,000.0