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Consolidated Statement Of Stockholders' Equity - 6 months ended Mar. 31, 2017 - 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 $ 419.5 $ 1.6 $ 1,563.9 $ (1,078.9) $ (68.3) $ 1.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) Attributable to Parent 80.0 0.0 0.0   0.0  
Net Income (Loss) Attributable to Noncontrolling Interest           (0.1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 79.9          
Dividends declared (11.2) 0.0 (11.2) 0.0 0.0 0.0
Stock repurchased under buyback program 50.0 0.0 50.0 0.0 0.0 0.0
Shares retained for employee taxes (2.7) 0.0   0.0 0.0 0.0
Stock-based compensation 3.6 0.0 3.6 0.0 0.0 0.0
Stock issued under stock compensation plans 3.9 0.0 3.9 0.0 0.0 0.0
Other Comprehensive Income (Loss), Net of Tax 3.9 0.0 0.0 0.0 3.9 0.0
Balance at Mar. 31, 2017 $ 446.9 $ 1.6 $ 1,507.5 $ (998.9) $ (64.4) $ 1.1