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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2016   28.3        
Beginning 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 loss (66.8)     (66.8)    
Other comprehensive income 7.1       7.1  
Stock-based compensation charges 4.5   4.5      
Employee stock purchase plan 0.3   0.3      
Net transfers with THC (4.0)   (4.0)      
Ending balance at Jun. 30, 2017 $ 258.8 $ 0.3 $ 1,754.1 $ (692.0) $ (111.6) $ (692.0)
Ending balance (in shares) at Jun. 30, 2017   28.3