Condensed Consolidated Statements Of Shareholder's Equity - USD ($) shares in Millions, $ in Millions	SB/RH [Member] Other Capital [Member]	SB/RH [Member] Accumulated Earnings (Deficit) [Member]	SB/RH [Member] Accumulated Other Comprehensive Loss [Member]	SB/RH [Member] Total Shareholders' Equity [Member]	SB/RH [Member] Non-controlling Interest [Member]	SB/RH [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Earnings (Deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total Shareholders' Equity [Member]	Non-controlling Interest [Member]	Total
Balances at Sep. 30, 2017	$ 2,079.0	$ (42.8)	$ (209.6)	$ 1,826.6	$ 8.8	$ 1,835.4	$ 2.0	$ 1,372.9	$ (925.9)	$ 309.0		$ 758.0	$ 1,188.9	$ 1,946.9
Balances, shares at Sep. 30, 2017							200.6
Net (loss) income from continuing operations		146.8		146.8	0.9	147.7			40.0			40.0	57.2	97.2
(Loss) income from discontinued operations, net of tax		21.7		21.7		21.7			467.4			467.4	14.2	481.6
Other comprehensive income (loss), net of tax			(0.3)	(0.3)	0.2	(0.1)				9.5		9.5	2.5	12.0
Sale and decconsolidation of HRG - Insurance Operations										(445.9)		(445.9)	(446.4)	(892.3)
Purchase of subsidiary stock								(10.3)		0.6		(9.7)	1.7	(8.0)
Excess of stock options and warrants								1.4				1.4		1.4
Excess of stock options and warrants, shares							0.1
Restricted stock issued and related tax withholdings	(3.9)			(3.9)		(3.9)		(3.6)				(3.6)	(2.2)	(5.8)
Share based compensation	4.4			4.4		4.4		3.3				3.3	2.0	5.3
Dividend paid by subsidiary to noncontrolling interest		(24.2)		(24.2)		(24.2)							(10.7)	(10.7)
Balances at Dec. 31, 2017	2,079.5	101.5	(209.9)	1,971.1	9.9	1,981.0	$ 2.0	1,363.7	(418.5)	(126.8)		820.4	807.2	1,627.6
Balances, shares at Dec. 31, 2017							200.7
Balances at Sep. 30, 2017	2,079.0	(42.8)	(209.6)	1,826.6	8.8	1,835.4	$ 2.0	1,372.9	(925.9)	309.0		758.0	1,188.9	1,946.9
Balances, shares at Sep. 30, 2017							200.6
Net (loss) income from continuing operations														461.6
(Loss) income from discontinued operations, net of tax														526.5
Balances at Jun. 30, 2018	2,071.4	(126.3)	(223.3)	1,721.8	9.9	1,731.7	$ 2.1	1,270.4	(41.8)	(141.8)		1,088.9	647.5	1,736.4
Balances, shares at Jun. 30, 2018							203.2
Balances at Dec. 31, 2017	2,079.5	101.5	(209.9)	1,971.1	9.9	1,981.0	$ 2.0	1,363.7	(418.5)	(126.8)		820.4	807.2	1,627.6
Balances, shares at Dec. 31, 2017							200.7
Net (loss) income from continuing operations		14.8		14.8	0.1	14.9			(32.6)			(32.6)	(2.1)	(34.7)
(Loss) income from discontinued operations, net of tax		11.3		11.3		11.3			3.7			3.7	7.6	11.3
Other comprehensive income (loss), net of tax			11.8	11.8	0.3	12.1				7.0		7.0	5.1	12.1
Purchase of subsidiary stock								(96.3)		(5.5)		(101.8)	(148.5)	(250.3)
Excess of stock options and warrants							$ 0.1	8.6				8.7		8.7
Excess of stock options and warrants, shares							1.5
Restricted stock issued and related tax withholdings	(0.1)			(0.1)		(0.1)		(0.7)				(0.7)		(0.7)
Share based compensation	(8.7)			(8.7)		(8.7)		(4.9)				(4.9)	(3.1)	(8.0)
Dividend paid by subsidiary to noncontrolling interest		(274.4)		(274.4)		(274.4)							(9.1)	(9.1)
Balances at Mar. 31, 2018	2,070.7	(146.8)	(198.1)	1,725.8	10.3	1,736.1	$ 2.1	1,270.4	(447.4)	(125.3)		699.8	657.1	1,356.9
Balances, shares at Mar. 31, 2018							202.2
Net (loss) income from continuing operations		45.9		45.9	0.2	46.1			382.9			382.9	16.0	398.9
(Loss) income from discontinued operations, net of tax		27.8		27.8		27.8			22.7			22.7	11.1	33.8
Other comprehensive income (loss), net of tax			(25.2)	(25.2)	(0.6)	(25.8)				(15.7)		(15.7)	(10.1)	(25.8)
Purchase of subsidiary stock								(10.9)		(0.8)		(11.7)	(18.3)	(30.0)
Excess of stock options and warrants								10.6				10.6		10.6
Excess of stock options and warrants, shares							1.0
Restricted stock issued and related tax withholdings	(0.9)			(0.9)		(0.9)		(1.3)				(1.3)	(0.3)	(1.6)
Share based compensation	1.6			1.6		1.6		1.6				1.6	0.7	2.3
Dividend paid by subsidiary to noncontrolling interest		(53.2)		(53.2)		(53.2)							(8.7)	(8.7)
Balances at Jun. 30, 2018	2,071.4	(126.3)	(223.3)	1,721.8	9.9	1,731.7	$ 2.1	1,270.4	(41.8)	(141.8)		1,088.9	647.5	1,736.4
Balances, shares at Jun. 30, 2018							203.2
Balances at Sep. 30, 2018	2,073.0	(235.5)	(235.7)	1,601.8	9.9	1,611.7	$ 0.5	1,996.7	(180.1)	(235.8)		1,581.3	8.3	1,589.6
Balances, shares at Sep. 30, 2018							53.4
Net (loss) income from continuing operations		(19.1)		(19.1)	0.2	(18.9)			(29.2)			(29.2)	0.2	(29.0)
(Loss) income from discontinued operations, net of tax		(83.2)		(83.2)		(83.2)			(83.2)			(83.2)		(83.2)
Other comprehensive income (loss), net of tax			(11.1)	(11.1)		(11.1)				(11.0)		(11.0)		(11.0)
Treasury stock repurchases											$ (18.5)	(18.5)		(18.5)
Treasury stock repurchases, shares											(0.3)
Restricted stock issued and related tax withholdings	11.3			11.3		11.3		7.5	(0.2)		$ 3.9	11.2		11.2
Restricted stock issued and related tax withholdings, shares							0.3
Share based compensation	2.8			2.8		2.8		3.2				3.2		3.2
Dividends declared									(22.5)			(22.5)		(22.5)
Dividend paid by subsidiary to noncontrolling interest		(30.4)		(30.4)		(30.4)
Balances at Dec. 30, 2018	2,087.1	(371.4)	(246.8)	1,468.9	10.1	1,479.0	$ 0.5	2,007.4	(318.4)	(246.8)	(14.6)	1,428.1	8.5	1,436.6
Balances, shares at Dec. 30, 2018							53.4
Balances at Sep. 30, 2018	2,073.0	(235.5)	(235.7)	1,601.8	9.9	1,611.7	$ 0.5	1,996.7	(180.1)	(235.8)		1,581.3	8.3	1,589.6
Balances, shares at Sep. 30, 2018							53.4
Net (loss) income from continuing operations						(60.1)								(107.6)
(Loss) income from discontinued operations, net of tax						699.1								699.1
Balances at Jun. 30, 2019	2,105.8	(297.8)	(228.7)	1,579.3	11.0	1,590.3	$ 0.5	2,025.3	340.5	(228.7)	(263.0)	1,874.6	9.4	1,884.0
Balances, shares at Jun. 30, 2019							48.8
Cumulative adjustment for adoption of new accounting standards (Note 2)		(3.2)		(3.2)		(3.2)			(3.2)			(3.2)		(3.2)
Balances at Dec. 30, 2018	2,087.1	(371.4)	(246.8)	1,468.9	10.1	1,479.0	$ 0.5	2,007.4	(318.4)	(246.8)	(14.6)	1,428.1	8.5	1,436.6
Balances, shares at Dec. 30, 2018							53.4
Net (loss) income from continuing operations		(13.4)		(13.4)	1.0	(12.4)			(55.0)			(55.0)	1.0	(54.0)
(Loss) income from discontinued operations, net of tax		783.6		783.6		783.6			783.6			783.6		783.6
Sale and decconsolidation of discontinued operations			21.9	21.9		21.9				21.9		21.9		21.9
Other comprehensive income (loss), net of tax			2.6	2.6		2.6				2.6		2.6		2.6
Treasury stock repurchases											$ (250.0)	(250.0)		(250.0)
Treasury stock repurchases, shares											(4.6)
Restricted stock issued and related tax withholdings	0.2			0.2		0.2		(0.2)			$ 0.4	0.2		0.2
Share based compensation	9.9			9.9		9.9		10.3				10.3		10.3
Dividends declared									(22.6)			(22.6)		(22.6)
Dividend paid by subsidiary to noncontrolling interest		(646.0)		(646.0)		(646.0)
Balances at Mar. 31, 2019	2,097.2	(247.2)	(222.3)	1,627.7	11.1	1,638.8	$ 0.5	2,017.5	387.6	(222.3)	(264.2)	1,919.1	9.5	1,928.6
Balances, shares at Mar. 31, 2019							48.8
Net (loss) income from continuing operations		(28.9)		(28.9)		(28.9)			(24.7)			(24.7)		(24.7)
(Loss) income from discontinued operations, net of tax		(1.2)		(1.2)		(1.2)			(1.2)			(1.2)		(1.2)
Other comprehensive income (loss), net of tax			(6.4)	(6.4)	(0.1)	(6.5)				(6.4)		(6.4)	(0.1)	(6.5)
Restricted stock issued and related tax withholdings	(0.7)			(0.7)		(0.7)		(1.9)			1.2	(0.7)		(0.7)
Share based compensation	9.3			9.3		9.3		9.7				9.7		9.7
Dividends declared									(21.2)			(21.2)		(21.2)
Dividend paid by subsidiary to noncontrolling interest		(20.5)		(20.5)		(20.5)
Balances at Jun. 30, 2019	$ 2,105.8	$ (297.8)	$ (228.7)	$ 1,579.3	$ 11.0	$ 1,590.3	$ 0.5	$ 2,025.3	$ 340.5	$ (228.7)	$ (263.0)	$ 1,874.6	$ 9.4	$ 1,884.0
Balances, shares at Jun. 30, 2019							48.8