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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - 6 months ended Jun. 30, 2018 - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2017 $ 1,132.1 $ 0.9 $ 1,523.1 $ (291.9) $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net earnings (loss) 4.3     4.3  
Other comprehensive loss, net of tax (4.3)       (4.3)
Stock-based compensation expense 14.3   14.3    
Common stock issued for exercise of stock options 0.3   0.3    
Tax on restricted stock unit vesting (4.1)   (4.1)    
Balance at Jun. 30, 2018 $ 1,142.6 $ 0.9 $ 1,533.6 $ (287.6) $ (104.3)