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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2014   30,600,000        
Beginning balance at Dec. 31, 2014 $ 1,693.7 $ 0.3 $ 2,530.0 $ (716.8) $ (32.3) $ (87.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 111.3     111.3    
Other comprehensive income (103.1)       (103.1)  
Net settlement on vesting of equity awards (in shares)   100,000        
Net settlement on vesting of equity awards (5.0)   (5.0)      
Stock-based compensation charges 2.7   2.7      
Exercise of stock options and other 5.1   5.1      
Share repurchase (in shares)   (2,500,000)        
Share repurchase (604.5)         (604.5)
Capital contributions from affiliates 198.8   198.8      
Distribution and net transfers to THC 1,003.0   1,003.0      
Ending balance (in shares) at Dec. 31, 2015   28,200,000        
Ending balance at Dec. 31, 2015 2,302.0 $ 0.3 3,734.6 (605.5) (135.4) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (19.7)     (19.7)    
Other comprehensive income 16.7       16.7  
Net settlement on vesting of equity awards (0.5)   (0.5)      
Stock-based compensation charges 5.5   5.5      
Exercise of stock options and other (in shares)   100,000        
Exercise of stock options and other 10.0   10.0      
Distribution and net transfers to THC (1,996.3)   (1,996.3)      
Ending balance (in shares) at Dec. 31, 2016   28,300,000        
Ending balance at Dec. 31, 2016 317.7 $ 0.3 1,753.3 (625.2) (118.7) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 160.3     160.3    
Other comprehensive income 20.1       20.1  
Net settlement on vesting of equity awards (0.1)   (0.1)      
Cumulative effect of a change in accounting for stock-based payments (Note 2) 2.5     2.5    
Stock-based compensation charges $ 10.1   10.1      
Exercise of stock options and other (in shares) 18,940          
Exercise of stock options and other $ 0.7   0.7      
Employee stock purchase plan 1.1   1.1      
Distribution and net transfers to THC (2.0)   (2.0)      
Ending balance (in shares) at Dec. 31, 2017   28,300,000        
Ending balance at Dec. 31, 2017 $ 510.4 $ 0.3 $ 1,763.1 $ (462.4) $ (98.6) $ (692.0)