Divestitures (Summary Of Components Of Income From HRG Insurance Discontinued Operations) (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (loss) income from discontinued operations				$ 497.9	$ 295.2
Net (loss) income from discontinued operations attributable to controlling interest		$ (0.1)	$ 18.7	$ 479.6	220.8
HRG Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	$ 378.6		428.9		1,170.7
Total operating costs and expenses	329.9		362.2		894.5
Operating income	48.7		66.7		276.2
Interest expense and other	4.0		6.1		18.2
(Write-down) write-up of assets of business held for sale to fair value less cost to sell	(14.2)		(36.1)		35.6
Reclassification of accumulated other comprehensive income	445.9
(Loss) income from discontinued operations before income taxes	476.4		24.5		293.6
Income tax expense	16.5		16.8		98.2
Net (loss) income from discontinued operations	459.9		7.7		195.4
Net income from discontinued operations attributable to non-controlling interest	5.4		4.1		31.6
Net (loss) income from discontinued operations attributable to controlling interest	454.5		3.6		163.8
HRG Insurance Operations [Member] | Insurance Premiums [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	6.8		12.7		27.0
HRG Insurance Operations [Member] | Net Investment Income [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	181.9		269.4		778.6
HRG Insurance Operations [Member] | Net Investment Gains [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	154.8		102.8		237.5
HRG Insurance Operations [Member] | Other [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	35.1		44.0		127.6
HRG Insurance Operations [Member] | Benefits And Other Changes In Policy Reserves [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total operating costs and expenses	241.3		266.0		575.4
HRG Insurance Operations [Member] | Selling, Acquisition, Operating And General Expenses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total operating costs and expenses	52.8		42.7		109.1
HRG Insurance Operations [Member] | Amortization Of Intangibles [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total operating costs and expenses	$ 35.8		$ 53.5		$ 210.0