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Consolidated Statement Of Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
Noncontrolling Interest [Member]
Balance at Sep. 30, 2016 $ 489.5 $ 1.6 $ 1,494.2 $ (955.6) $ (51.8) $ 1.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) Attributable to Parent 6.7          
Balance at Dec. 31, 2016 534.3 1.6 1,482.4 (900.5) (50.2) 1.0
Balance at Sep. 30, 2017 489.5          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared (6.3) 0.0 (6.3) 0.0 0.0 0.0
Stock repurchased under buyback program 10.0 0.0 10.0 0.0 0.0 0.0
Stock-based compensation 2.0 0.0 2.0 0.0 0.0 0.0
Shares retained for employee taxes (1.8) 0.0   0.0 0.0 0.0
Stock issued under stock compensation plans 4.3 0.0 4.3 0.0 0.0 0.0
Other Comprehensive Income (Loss), Net of Tax 1.6 0.0 0.0 $ 0.0 1.6 0.0
Net Income (Loss) Attributable to Parent 55.1 $ 0.0 $ 0.0   $ 0.0  
Net Income (Loss) Attributable to Noncontrolling Interest           $ (0.1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 55.0          
Balance at Dec. 31, 2017 $ 534.3