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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Non-controlling Interest
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             (2.7)
Acquisition of non-controlling interest             0.5
Balance at end of period at Sep. 30, 2018             0.0
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 $ 1.0 $ (1,737.2) $ 508.0 $ 1,416.2 $ (75.5) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 88.2       88.2    
Net income (loss) attributable to non-controlling interest (0.1)           (0.1)
Acquisition of non-controlling interest in subsidiary 1.3           1.3
Adjustment to pension liability, net of tax (0.1)         (0.1)  
Foreign currency adjustments (8.7)         (8.7)  
Exercise of stock options (in shares)     (0.1)        
Exercise of stock options 4.2   $ 1.6 2.6      
Issuances of PRSUs, RSUs, and DSUs (in shares)     (0.2)        
Issuances of PRSUs, RSUs, and DSUs 0.0   $ 2.7 (2.7)      
Treasury stock repurchased (in shares)     0.1        
Treasury stock repurchased (3.5)   $ (3.5)        
Amortization of unearned stock-based compensation 19.6     19.6      
Acquisition of non-controlling interest (0.5)     (0.5)      
Balance at ending of period (in shares) at Sep. 30, 2018   99.2 44.8        
Balance at end of period at Sep. 30, 2018 209.5 $ 1.0 $ (1,736.4) 527.0 1,501.5 (84.8) 1.2
Balance at beginning of period at Jun. 30, 2018             0.4
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net loss attributable to non-controlling interest             (0.9)
Acquisition of non-controlling interest             0.5
Balance at end of period at Sep. 30, 2018             0.0
Balance at beginning of period (in shares) at Jun. 30, 2018   99.2 44.9        
Balance at beginning of period at Jun. 30, 2018 157.7 $ 1.0 $ (1,736.9) 520.4 1,459.2 (87.2) 1.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 42.3       42.3    
Net income (loss) attributable to non-controlling interest 0.0          
Foreign currency adjustments 2.4         2.4  
Exercise of stock options (in shares)     0.0        
Exercise of stock options 1.6   $ 0.6 1.0      
Issuances of PRSUs, RSUs, and DSUs (in shares)     (0.1)        
Issuances of PRSUs, RSUs, and DSUs 0.0   $ 0.4 (0.4)      
Treasury stock repurchased (in shares)     0.0        
Treasury stock repurchased (0.5)   $ (0.5)        
Amortization of unearned stock-based compensation 6.5     6.5      
Acquisition of non-controlling interest (0.5)     (0.5)      
Balance at ending of period (in shares) at Sep. 30, 2018   99.2 44.8        
Balance at end of period at Sep. 30, 2018 209.5 $ 1.0 $ (1,736.4) 527.0 1,501.5 (84.8) 1.2
Balance at beginning of period at Dec. 31, 2018             0.0
Balance at end of period at Sep. 30, 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 $ 1.0 $ (1,737.0) 532.1 1,513.8 (95.3) 2.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 143.3       143.3    
Net income (loss) attributable to non-controlling interest 0.0           0.0
Repurchase of interest in subsidiary (1.9)           (1.9)
Foreign currency adjustments 0.3         0.3  
Exercise of stock options (in shares)     (0.3)        
Exercise of stock options 12.8   $ 3.6 9.2      
Issuances of PRSUs, RSUs, and DSUs (in shares)     (0.2)        
Issuances of PRSUs, RSUs, and DSUs 0.0   $ 3.6 (3.6)      
Treasury stock repurchased (in shares)     0.8        
Treasury stock repurchased (55.5)   $ (55.5)        
Amortization of unearned stock-based compensation 20.0     20.0      
Balance at ending of period (in shares) at Sep. 30, 2019   99.2 45.0        
Balance at end of period at Sep. 30, 2019 336.5 $ 1.0 $ (1,785.3) 557.7 1,657.1 (95.0) 1.0
Balance at beginning of period at Jun. 30, 2019             0.0
Balance at end of period at Sep. 30, 2019             0.0
Balance at beginning of period (in shares) at Jun. 30, 2019   99.2 44.4        
Balance at beginning of period at Jun. 30, 2019 305.9 $ 1.0 $ (1,737.3) 545.6 1,583.8 (88.3) 1.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 73.3       73.3    
Net income (loss) attributable to non-controlling interest (0.1)           (0.1)
Foreign currency adjustments (6.7)         (6.7)  
Exercise of stock options (in shares)     (0.1)        
Exercise of stock options 7.3   $ 1.9 5.4      
Issuances of PRSUs, RSUs, and DSUs 0.0   $ 0.1 (0.1)      
Treasury stock repurchased (in shares)     0.7        
Treasury stock repurchased (50.0)   $ (50.0)        
Amortization of unearned stock-based compensation 6.8     6.8      
Balance at ending of period (in shares) at Sep. 30, 2019   99.2 45.0        
Balance at end of period at Sep. 30, 2019 $ 336.5 $ 1.0 $ (1,785.3) $ 557.7 $ 1,657.1 $ (95.0) $ 1.0