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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
shares in Millions, $ in Millions
Total
Redeemable non-controlling interest
Common Stock
Treasury Stock
Additional Paid in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Balance at beginning of period at Dec. 31, 2015   $ 12.4          
Balance at beginning of period (in shares) at Dec. 31, 2015     99.2 36.8      
Balance at beginning of period at Dec. 31, 2015 $ 267.8 0.0 $ 1.0 $ (1,174.4) $ 463.4 $ 1,074.2 $ (96.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 190.6         190.6  
Net income (loss) attributable to noncontrolling interests   (4.8)          
Net loss attributable to non-controlling interests 0.8 0.8          
Acquisition of non-controlling interest in subsidiary 3.8 3.8          
Adjustment to pension liability, net of tax (0.8)           (0.8)
Unrealized loss on cash flow hedging derivatives, net of tax (6.0)           (6.0)
Foreign currency adjustments (0.3)           (0.3)
Exercise of stock options (in shares)       (0.6)      
Exercise of stock options 15.7     $ 7.9 7.8    
Issuances of PRSUs, RSUs and DSUs (shares)       (0.1)      
Issuances of PRSUs, RSUs, and DSUs (0.1)     $ 1.5 (1.6)    
Tax adjustments related to stock compensation $ 7.0       7.0    
Treasury stock repurchased (in shares) 8.7     8.7      
Treasury stock repurchased $ (533.0)     $ (533.0)      
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares)       0.0      
Treasury stock repurchased - PRSU/RSU/DSU releases (2.0)     $ (2.0)      
Amortization of unearned stock-based compensation 16.2       16.2    
Balance at end of period at Dec. 31, 2016   7.6          
Balance at end of period (in shares) at Dec. 31, 2016     99.2 44.8      
Balance at ending of period at Dec. 31, 2016 (41.9) 3.0 $ 1.0 $ (1,700.0) 492.8 1,264.8 (103.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 151.4         151.4  
Net income (loss) attributable to noncontrolling interests   (5.4)          
Net loss attributable to non-controlling interests 5.3 5.3          
Adjustment to pension liability, net of tax (0.5)           (0.5)
Unrealized loss on cash flow hedging derivatives, net of tax (0.6)           (0.6)
Foreign currency adjustments 29.1           29.1
Exercise of stock options (in shares)       (0.3)      
Exercise of stock options $ 12.8     $ 4.5 8.3    
Issuances of PRSUs, RSUs and DSUs (shares)       (0.2)      
Issuances of PRSUs, RSUs, and DSUs       $ 3.2 (3.2)    
Treasury stock repurchased (in shares) 0.6     0.6      
Treasury stock repurchased $ (40.1)     $ (40.1)      
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares)       0.1      
Treasury stock repurchased - PRSU/RSU/DSU releases (4.8)     $ (4.8)      
Amortization of unearned stock-based compensation 13.3       13.3    
Acquisition of non-controlling interest (0.9) (2.3)     (3.2)    
Balance at end of period at Dec. 31, 2017   2.2          
Balance at end of period (in shares) at Dec. 31, 2017     99.2 45.0      
Balance at ending 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 100.5         100.5  
Net income (loss) attributable to noncontrolling interests   (2.7)          
Net loss attributable to non-controlling interests (0.2) (0.2)          
Acquisition of non-controlling interest in subsidiary 3.1 3.1          
Adjustment to pension liability, net of tax (0.9)            
Adjustment to pension liability, net of tax 0.4           (0.4)
Unrealized loss on cash flow hedging derivatives, net of tax 0.0            
Foreign currency adjustments (18.9)           (18.9)
Exercise of stock options (in shares)       (0.2)      
Exercise of stock options 4.6     $ 2.1 2.5    
Issuances of PRSUs, RSUs and DSUs (shares)       (0.2)      
Issuances of PRSUs, RSUs, and DSUs 0.0     $ 2.7 (2.7)    
Treasury stock repurchased - PRSU/RSU/DSU releases (in shares)       0.1      
Treasury stock repurchased - PRSU/RSU/DSU releases (4.6)     $ (4.6)      
Amortization of unearned stock-based compensation 24.8       24.8    
Acquisition of non-controlling interest (0.5) (0.5)     (0.5)    
Balance at end of period at Dec. 31, 2018   0.0          
Balance at end of period (in shares) at Dec. 31, 2018     99.2 44.7      
Balance at ending of period at Dec. 31, 2018 $ 217.5 $ 2.9 $ 1.0 $ (1,737.0) $ 532.1 $ 1,513.8 $ (95.3)