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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY Statement - USD ($)
shares in Millions, $ in Millions
Total
Non-controlling Interest
Common Stock
Treasury Stock
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Balance at beginning of period at Dec. 31, 2017 $ 2.2            
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net loss attributable to non-controlling interest (0.3)            
Balance at end of period at Mar. 31, 2018 1.9            
Balance at beginning of period (in shares) at Dec. 31, 2017     99.2 45.0      
Balance at beginning of period at Dec. 31, 2017 112.5 $ 0.0 $ 1.0 $ (1,737.2) $ 508.0 $ 1,416.2 $ (75.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 23.1         23.1  
Net loss attributable to non-controlling interest 0.0            
Adjustment to pension liability, net of tax (0.1)           (0.1)
Foreign currency adjustments 5.0           5.0
Exercise of stock options (in shares)       0.0      
Exercise of stock options 1.9     $ 0.6 1.3    
Issuances of PRSUs, RSUs, and DSUs (in shares)       (0.1)      
Issuances of PRSUs, RSUs, and DSUs 0.0     $ 2.0 (2.0)    
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares)       0.1      
Treasury stock repurchased - PRSU/RSU/DSU releases (2.9)     $ (2.9)      
Amortization of unearned stock-based compensation 6.3       6.3    
Balance at ending of period (in shares) at Mar. 31, 2018     99.2 45.0      
Balance at end of period at Mar. 31, 2018 142.4 0.0 $ 1.0 $ (1,737.5) 513.6 1,436.4 (71.1)
Balance at beginning of period at Dec. 31, 2018 0.0            
Balance at end of period at Mar. 31, 2019 0.0            
Balance at beginning of period (in shares) at Dec. 31, 2018     99.2 44.7      
Balance at beginning of period at Dec. 31, 2018 217.5 2.9 $ 1.0 $ (1,737.0) 532.1 1,513.8 (95.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 28.4         28.4  
Net loss attributable to non-controlling interest 0.2 0.2          
Repurchase of interest in subsidiary (1.9) (1.9)          
Foreign currency adjustments 4.0           4.0
Exercise of stock options (in shares)       0.1      
Exercise of stock options 2.4     $ 0.8 1.6    
Issuances of PRSUs, RSUs, and DSUs (in shares)       0.2      
Issuances of PRSUs, RSUs, and DSUs 0.0     $ 3.2 (3.2)    
Treasury stock repurchased (0.8)     $ (0.8)      
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares)       0.1      
Treasury stock repurchased - PRSU/RSU/DSU releases (2.9)     $ (2.9)      
Amortization of unearned stock-based compensation 6.6       6.6    
Balance at ending of period (in shares) at Mar. 31, 2019     99.2 44.5      
Balance at end of period at Mar. 31, 2019 $ 253.5 $ 1.2 $ 1.0 $ (1,736.7) $ 537.1 $ 1,542.2 $ (91.3)