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Consolidated Statement Of Stockholders' Equity - 6 months ended Mar. 31, 2018 - USD ($)
$ in Millions
Total
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
Noncontrolling Interest [Member]
Balance at Sep. 30, 2017 $ 489.5          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared (14.3) $ 0.0 $ (14.3) $ 0.0 $ 0.0 $ 0.0
Stock repurchased under buyback program 20.0 0.0 20.0 0.0 0.0 0.0
Stock-based compensation 3.5 0.0 3.5 0.0 0.0 0.0
Shares retained for employee taxes (2.1) 0.0   0.0 0.0 0.0
Stock issued under stock compensation plans 6.4 0.0 6.4 0.0 0.0 0.0
Other Comprehensive Income (Loss), Net of Tax 3.4 0.0 0.0 0.0 3.4 0.0
Net Income (Loss) Attributable to Parent 65.3 0.0 0.0   0.0  
Net Income (Loss) Attributable to Noncontrolling Interest           0.1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 65.4          
Balance at Mar. 31, 2018 $ 531.8 $ 1.6 $ 1,467.7 $ (890.3) $ (48.4) $ 1.2