v3.25.2
Stockholders' Equity, Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Change in Stockholders' Equity (Deficit) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Beginning Balance $ 813.3 $ 824.5 $ 897.2 $ 914.5 $ 824.5 $ 914.5
Beginning Balance, shares   39,899,093     39,899,093  
Beginning Balance Treasury Stock, shares   8,051,266     8,051,266  
Net income (loss) 2.1 $ (5.3) 10.3 (7.4) $ (3.2) 2.9
Foreign currency translation 8.6 0.2 (3.1) (3.4)    
Changes in defined benefit pension and other post-retirement benefit plans, net of tax (0.2) (1.0) (1.0) 1.1    
Share repurchases, net of tax     (14.1) (1.0)    
Stock-based compensation expense, net 3.5 0.7 4.1 (0.4)    
Issuance of common stock     0.1      
Dividends declared to non-controlling interest     (0.6)      
Cash dividends and dividend equivalents (6.1) (5.8) (6.5) (6.2)    
Ending Balance $ 821.2 813.3 886.4 897.2 $ 821.2 886.4
Ending Balance, shares 40,360,234       40,360,234  
Ending Balance Treasury Stock, shares 8,164,148       8,164,148  
Common Stock [Member]            
Beginning Balance $ 0.4 $ 0.4 $ 0.4 $ 0.4 $ 0.4 $ 0.4
Beginning Balance, shares 40,358,000 39,899,000 39,887,000 39,451,000 39,899,000 39,451,000
Stock-based compensation expense, net, shares 2,000 459,000 1,000 436,000    
Issuance of common stock, shares     6,000      
Ending Balance $ 0.4 $ 0.4 $ 0.4 $ 0.4 $ 0.4 $ 0.4
Ending Balance, shares 40,360,000 40,358,000 39,894,000 39,887,000 40,360,000 39,894,000
Treasury Stock [Member]            
Beginning Balance $ (237.0) $ (234.4) $ (184.0) $ (179.3) $ (234.4) $ (179.3)
Beginning Balance Treasury Stock, shares (8,164,000) (8,051,000) (5,555,000) (5,413,000) (8,051,000) (5,413,000)
Share repurchases, net of tax     $ (14.1) $ (1.0)    
Shares repurchases, net of tax, treasury stock, Shares     (647,000) (31,000)    
Stock-based compensation expense, net, treasury stock, shares   (113,000)   (111,000)    
Stock-based compensation expense, net, treasury stock, amount   $ (2.6)   $ (3.7)    
Ending Balance $ (237.0) $ (237.0) $ (198.1) $ (184.0) $ (237.0) $ (198.1)
Ending Balance Treasury Stock, shares (8,164,000) (8,164,000) (6,202,000) (5,555,000) (8,164,000) (6,202,000)
Capital in Excess of Par Value [Member]            
Beginning Balance $ 427.1 $ 423.5 $ 415.1 $ 411.6 $ 423.5 $ 411.6
Stock-based compensation expense, net 3.5 3.3 4.1 3.3    
Issuance of common stock     0.1      
Cash dividends and dividend equivalents   0.3   0.2    
Ending Balance 430.6 427.1 419.3 415.1 430.6 419.3
Retained Earnings [Member]            
Beginning Balance 767.9 779.6 799.2 813.2 779.6 813.2
Net income (loss) 1.9 (5.6) 9.9 (7.6)    
Cash dividends and dividend equivalents (6.1) (6.1) (6.5) (6.4)    
Ending Balance 763.7 767.9 802.6 799.2 763.7 802.6
Foreign Currency Translation [Member]            
Beginning Balance (67.2) (67.5) (55.5) (52.2) (67.5) (52.2)
Foreign currency translation 8.5 0.3 (3.1) (3.3)    
Ending Balance (58.7) (67.2) (58.6) (55.5) (58.7) (58.6)
Benefit Plan Liabilities [Member]            
Beginning Balance (87.3) (86.3) (86.7) (87.8) (86.3) (87.8)
Changes in defined benefit pension and other post-retirement benefit plans, net of tax (0.2) (1.0) (1.0) 1.1    
Ending Balance (87.5) (87.3) (87.7) (86.7) (87.5) (87.7)
Non-controlling Interest [Member]            
Beginning Balance 9.4 9.2 8.7 8.6 9.2 8.6
Net income (loss) 0.2 0.3 0.4 0.2    
Foreign currency translation 0.1 (0.1)   (0.1)    
Dividends declared to non-controlling interest     (0.6)      
Ending Balance $ 9.7 $ 9.4 $ 8.5 $ 8.7 $ 9.7 $ 8.5