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Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Jun. 30, 2018 - USD ($) $ in Millions | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | ---
Balances as of beginning of period at Sep. 30, 2017 | $ 449.9 | $ 0.2 | $ (46.3) | $ 259.0 | $ 261.5 | $ (24.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 39.8 |  |  |  | 39.8 |
Other comprehensive loss | (8.7) |  |  |  |  | (8.7)
Exercise of stock options | 1.8 |  |  | 1.8 |  |
Share-based Compensation | 4.9 |  |  | 4.9 |  |
Balances as of end of period at Jun. 30, 2018 | $ 487.7 | $ 0.2 | $ (46.3) | $ 265.7 | $ 301.3 | $ (33.2)

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