Divestitures - Schedule of (loss) income for discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax	$ 0.0	$ 0.0	$ 445.9	$ 0.0
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down		0.0	445.9	0.0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0.7	(43.6)	501.5	259.2
Net Income (Loss) Attributable to Parent	(37.1)	(82.1)	470.3	130.1
Less: Net income attributable to noncontrolling interest	0.5	30.7	72.0	79.3
Other income (expense), net	0.2	(1.4)	1.2	(0.4)
Interest Expense	(67.6)	(77.7)	(143.1)	(156.4)
Consolidated operating income	28.9	95.3	55.5	136.6
Costs and Expenses	737.2	662.1	1,357.1	1,223.1
Selling, acquisition, operating and general expenses	242.4	216.5	458.5	415.4
Consumer Products Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Income	0.1		0.4
Disposal Group, Including Discontinued Operation, Revenue	427.8	413.5	1,031.1	1,023.0
Disposal Group, Including Discontinued Operation, Costs of Goods Sold			684.1	663.7
Disposal Group, Including Discontinued Operation, General and Administrative Expense	134.4	109.2	266.1	230.5
Disposal Group, Including Discontinued Operation, Operating Expense	415.1	374.3	950.2	894.2
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	12.7	39.2	80.9	128.8
Disposal Group, Including Discontinued Operation, Interest Income	12.4	11.7	26.1	24.5
Disposal Group, Including Discontinued Operation, Other Expense		(0.2)		(0.2)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0.2	27.7	54.4	104.5
Discontinued Operation, Tax Effect of Discontinued Operation	(0.5)	8.6	12.8	33.0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0.7	19.1	41.6	71.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest	0.3	7.7	17.1	30.0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.4	11.4	24.5	41.5
FGL [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell					$ 402.2
Insurance Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Write-down of assets held for sale to fair value less costs to sell					$ (421.2)
Disposal Group, Including Discontinued Operation, Other Income		0.1		0.1
Disposal Group, Including Discontinued Operation, Revenue		418.4	378.6	741.7
Disposal Group, Including Discontinued Operation, Benefits and other changes in policy reserves		301.1	241.3	309.4
Disposal Group, Including Discontinued Operation, General and Administrative Expense		35.7	52.8	66.4
Disposal Group, Including Discontinued Operation, Depreciation and Amortization		36.5	35.8	156.5
Disposal Group, Including Discontinued Operation, Operating Expense		373.3	329.9	532.3
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		45.1	48.7	209.4
Disposal Group, Including Discontinued Operation, Interest Expense		6.0	3.9	12.1
Disposal Group, Including Discontinued Operation, Other Expense			(0.1)
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax		72.8	14.2	(71.7)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		(33.6)	476.4	269.1
Discontinued Operation, Tax Effect of Discontinued Operation		29.1	16.5	81.4
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 0.0	(62.7)	459.9	187.7
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest		6.4	5.4	27.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent		(69.1)	454.5	160.2
Insurance Segment [Member] | Insurance Premiums [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		3.1	6.8	14.3
Insurance Segment [Member] | Net Investment Income
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		258.7	181.9	509.2
Insurance Segment [Member] | Gain (Loss) on Investments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		112.0	154.8	134.6
Insurance Segment [Member] | Insurance and investment product fees [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		$ 44.6	$ 35.1	$ 83.6