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Acquisition - Pro Forma Information and Significant Adjustments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Combinations [Abstract] |  |  |  |
Pro forma net sales | $ 647.2 | $ 684.0 | $ 2,000.4 | $ 2,077.2
Pro forma net earnings from continuing operations | 14.2 | 37.5 | 113.6 | 9.1
Pro forma mandatory preferred stock dividends | 4.1 | 4.1 | 12.2 | 12.2
Pro forma net earnings from continuing operations attributable to common shareholders | $ 10.1 | $ 33.4 | $ 101.4 | $ (3.1)
Pro forma diluted net earnings/(loss) per common share - continuing operations (in usd per share) | $ 0.14 | $ 0.47 | $ 1.43 | $ (0.04)
Pro forma weighted average shares of common stock - Diluted (in shares) | 70.6 | 71.4 | 71.0 | 71.4
Inventory step up | $ 5.0 | $ 0.0 | $ 27.5 | $ (26.5)
Acquisition and integration costs | 0.0 | 13.2 | 30.1 | (49.1)
Interest and ticking fees on escrowed debt | 0.0 | 3.4 | 27.5 | 4.9
Gains on escrowed funds | 0.0 | $ 0.0 | (12.0) | $ 0.0
Interest, pre-tax | $ 50.0 |  | $ 150.0 |

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