Divestitures (Summary Of Components Of Income From HRG Insurance Discontinued Operations) (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended
	Nov. 30, 2017	Dec. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from discontinued operations before income taxes		$ (92.9)	$ 506.0
HRG Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	$ 378.6
Total operating costs and expenses	329.9
Operating income	48.7
Interest expense and other	4.0
Write-down of assets of business held for sale to fair value less cost to sell	(14.2)
Reclassification of accumulated other comprehensive income	445.9
Income (Loss) from discontinued operations before income taxes	476.4
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
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
HRG Insurance Operations [Member] | Other Revenue [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	35.1
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
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
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
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
Discontinued Operations, Held-For-Sale [Member] | HRG Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from discontinued operations before income taxes			$ 476.4