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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Acquisitions (Schedule of Pro Forma Information and Significant Adjustments) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Pro forma net sales (unaudited)									$ 2,719.4	$ 2,773.7
Pro forma net earnings from continuing operations (unaudited)									159.7	40.1
Pro forma mandatory preferred stock dividends (unaudited)									16.2	16.2
Pro forma net earnings from continuing operations attributable to common shareholders (unaudited)									$ 143.5	$ 23.9
Pro forma diluted net earnings per common share - continuing operations (unaudited) (in dollars per share)									$ 2.02	$ 0.33
Pro forma weighted average shares of common stock - Diluted (unaudited) (in shares)									71.0	71.4
Inventory step up (unaudited)									$ 28.5	$ (27.8)
Acquisition and integration costs (unaudited)									44.3	(43.3)
Interest and ticking fees on escrowed debt (unaudited)									21.6	(75.7)
Gains on escrowed debt (unaudited)									(10.5)	(15.7)
Interest from new capital structure									200.0
Net sales	$ 719.0	$ 647.2	$ 556.4	$ 571.9	$ 457.2	$ 392.8	$ 374.4	$ 573.3	2,494.5	1,797.7	$ 1,755.7
Earnings before income taxes									73.1	$ 175.2	$ 273.3
Battery Acquisition
Business Acquisition [Line Items]
Inventory step up (unaudited)									14.6
Net sales									338.9
Earnings before income taxes									8.7
Spectrum Auto Care Acquisition
Business Acquisition [Line Items]
Inventory step up (unaudited)	$ 2.1								21.6
Net sales									315.8
Earnings before income taxes									$ 19.6