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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

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