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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
	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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Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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