Condensed Consolidated Statements Of Shareholder's Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Total Shareholders' Equity	Total Shareholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Deficit/Earnings	Accumulated Deficit/Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Non- controlling Interest	SB/RH	SB/RH Cumulative Effect, Period of Adoption, Adjustment	SB/RH Total Shareholders' Equity	SB/RH Total Shareholders' Equity Cumulative Effect, Period of Adoption, Adjustment	SB/RH Other Capital	SB/RH Accumulated Deficit/Earnings	SB/RH Accumulated Deficit/Earnings Cumulative Effect, Period of Adoption, Adjustment	SB/RH Accumulated Other Comprehensive Loss	SB/RH Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment	SB/RH Non- controlling Interest
Balances at Sep. 30, 2018	$ 1,589.6	$ (3.2)	$ 1,581.3	$ (3.2)	$ 0.5	$ 1,996.7	$ (180.1)	$ (3.2)	$ (235.8)		$ 0.0	$ 8.3	$ 1,611.7	$ (3.2)	$ 1,601.8	$ (3.2)	$ 2,073.0	$ (235.5)	$ (3.2)	$ (235.7)		$ 9.9
Balances, shares at Sep. 30, 2018					53,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	(29.0)		(29.2)				(29.2)					0.2	(18.9)		(19.1)			(19.1)				0.2
Income (loss) 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	(11.0)		(11.0)						(11.0)				(11.0)		(11.0)					(11.0)
Treasury stock repurchases	(18.5)		(18.5)								(18.5)
Treasury stock repurchases (in shares)					(300,000)
Restricted stock issued and related tax withholdings	11.2		11.2			7.5	(0.2)				3.9		11.3		11.3		11.3
Restricted stock issued and related tax withholdings (in shares)					300,000
Share based compensation	3.2		3.2			3.2							2.8		2.8		2.8
Dividends declared	(22.5)		(22.5)				(22.5)
Dividends paid to parent													(30.4)		(30.4)			(30.4)
Balances at Dec. 31, 2018	1,436.6		1,428.1		$ 0.5	2,007.4	(318.4)		(246.8)		(14.6)	8.5	1,479.1		1,469.0		2,087.1	(371.4)		(246.7)		10.1
Balances, shares at Dec. 31, 2018					53,400,000
Balances at Sep. 30, 2018	1,589.6	(3.2)	1,581.3	$ (3.2)	$ 0.5	1,996.7	(180.1)	(3.2)	(235.8)		0.0	8.3	1,611.7	(3.2)	1,601.8	$ (3.2)	2,073.0	(235.5)	(3.2)	(235.7)		9.9
Balances, shares at Sep. 30, 2018					53,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	(107.6)												(60.1)
Income (loss) from discontinued operations, net of tax	699.1												699.1
Treasury stock repurchases	$ (268.5)
Treasury stock repurchases (in shares)	(4,900,000)
Balances at Jun. 30, 2019	$ 1,884.0		1,874.6		$ 0.5	2,025.3	340.5		(228.7)		(263.0)	9.4	1,590.4		1,579.4		2,105.8	(297.8)		(228.6)		11.0
Balances, shares at Jun. 30, 2019					48,800,000
Balances at Dec. 31, 2018	1,436.6		1,428.1		$ 0.5	2,007.4	(318.4)		(246.8)		(14.6)	8.5	1,479.1		1,469.0		$ 2,087.1	(371.4)		(246.7)		10.1
Balances, shares at Dec. 31, 2018					53,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	(54.0)		(55.0)				(55.0)					1.0	(12.4)		(13.4)			(13.4)				1.0
Income (loss) from discontinued operations, net of tax	783.6		783.6				783.6								783.6			783.6
Sale and deconsolidation 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 (in shares)					(4,600,000)
Restricted stock issued and related tax withholdings	0.2		0.2			(0.2)					0.4		0.2		0.2
Restricted stock issued and related tax withholdings (in shares)																	200,000
Share based compensation	10.3		10.3			10.3							9.9		9.9		$ 9.9
Dividends declared	(22.6)		(22.6)				(22.6)
Dividends paid to parent													(646.0)		(646.0)			(646.0)
Balances at Mar. 31, 2019	1,928.6		1,919.1		$ 0.5	2,017.5	387.6		(222.3)		(264.2)	9.5	1,638.9		1,627.8		2,097.2	(247.2)		(222.2)		11.1
Balances, shares at Mar. 31, 2019					48,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	(24.7)		(24.7)				(24.7)						(28.9)		(28.9)			(28.9)
Income (loss) 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	$ (6.5)		(6.4)						(6.4)			(0.1)	(6.5)		(6.4)					(6.4)		(0.1)
Treasury stock repurchases (in shares)	0
Restricted stock issued and related tax withholdings	$ (0.7)		(0.7)			(1.9)					1.2		(0.7)		(0.7)		(0.7)
Share based compensation	9.7		9.7			9.7							9.3		9.3		9.3
Dividends declared	(21.2)		(21.2)				(21.2)
Dividends paid to parent													(20.5)		(20.5)			(20.5)
Balances at Jun. 30, 2019	1,884.0		1,874.6		$ 0.5	2,025.3	340.5		(228.7)		(263.0)	9.4	1,590.4		1,579.4		2,105.8	(297.8)		(228.6)		11.0
Balances, shares at Jun. 30, 2019					48,800,000
Balances at Sep. 30, 2019	1,728.9	0.0	1,720.9		$ 0.5	2,031.1	223.8	(0.3)	(273.6)	$ 0.3	(260.9)	8.0	1,434.7	0.0	1,425.1		2,113.3	(414.7)	(0.3)	(273.5)	$ 0.3	9.6
Balances, shares at Sep. 30, 2019					48,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	(37.7)		(38.6)				(38.6)					0.9	(36.8)		(37.7)			(37.7)				0.9
Income (loss) from discontinued operations, net of tax	2.8		2.8				2.8					0.0	2.8		2.8			2.8
Other comprehensive income (loss), net of tax	24.3		24.2						24.2			0.1	24.3		24.2					24.2		0.1
Treasury stock repurchases	(90.6)		(90.6)								(90.6)
Treasury stock repurchases (in shares)					(1,500,000)
Accelerated share repurchase pending final settlement	(125.0)		(125.0)			(18.7)					(106.3)
Accelerated share repurchase pending final settlement (in shares)					(1,700,000)
Restricted stock issued and related tax withholdings	4.9		4.9			(13.3)					18.2		4.9		4.9		4.9
Restricted stock issued and related tax withholdings (in shares)					500,000
Share based compensation	8.5		8.5			8.5
Share based compensation													8.5		8.5		8.5
Dividends declared	(20.2)		(20.2)				(20.2)
Dividends paid to parent													(36.7)		(36.7)			(36.7)
Balances at Dec. 29, 2019	1,495.9		1,486.9		$ 0.5	2,007.6	167.5		(249.1)		(439.6)	9.0	1,401.7		1,391.1		2,126.7	(486.6)		(249.0)		10.6
Balances, shares at Dec. 29, 2019					46,100,000
Balances at Sep. 30, 2019	1,728.9	$ 0.0	1,720.9		$ 0.5	2,031.1	223.8	$ (0.3)	(273.6)	$ 0.3	(260.9)	8.0	1,434.7	$ 0.0	1,425.1		2,113.3	(414.7)	$ (0.3)	(273.5)	$ 0.3	9.6
Balances, shares at Sep. 30, 2019					48,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	40.8												(12.2)
Income (loss) from discontinued operations, net of tax	12.2												12.2
Treasury stock repurchases	$ (364.6)
Treasury stock repurchases (in shares)	(6,200,000)
Balances at Jun. 28, 2020	$ 1,385.5		1,376.9		$ 0.5	2,042.8	217.3		(276.8)		(606.9)	8.6	1,237.9		1,227.7		2,142.9	(638.5)		(276.7)		10.2
Balances, shares at Jun. 28, 2020					43,100,000
Balances at Dec. 29, 2019	1,495.9		1,486.9		$ 0.5	2,007.6	167.5		(249.1)		(439.6)	9.0	1,401.7		1,391.1		2,126.7	(486.6)		(249.0)		10.6
Balances, shares at Dec. 29, 2019					46,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	(59.2)		(58.4)				(58.4)					(0.8)	(56.6)		(55.8)			(55.8)				(0.8)
Income (loss) from discontinued operations, net of tax	1.4		1.4				1.4						1.4		1.4			1.4
Sale and deconsolidation of assets held for sale	8.1		8.1						8.1				8.1		8.1					8.1
Other comprehensive income (loss), net of tax	(41.1)		(41.0)						(41.0)			(0.1)	(41.1)		(41.0)					(41.0)		(0.1)
Treasury stock repurchases	(149.2)		(149.2)								(149.2)
Treasury stock repurchases (in shares)					(2,700,000)
Accelerated share repurchase pending final settlement	0.0					18.5					(18.5)
Accelerated share repurchase pending final settlement (in shares)					(300,000)
Restricted stock issued and related tax withholdings	(0.3)		(0.3)			(0.7)					0.4		(0.3)		(0.3)		(0.3)
Share based compensation	8.9		8.9			8.9
Share based compensation													8.3		8.3		8.3
Dividends declared	(19.7)		(19.7)				(19.7)
Dividends paid to parent													(168.2)		(168.2)			(168.2)
Balances at Mar. 29, 2020	1,244.8		1,236.7		$ 0.5	2,034.3	90.8		(282.0)		(606.9)	8.1	1,153.3		1,143.6		2,134.7	(709.2)		(281.9)		9.7
Balances, shares at Mar. 29, 2020					43,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income from continuing operations	137.6		137.1				137.1					0.5	81.3		80.8			80.8				0.5
Income (loss) from discontinued operations, net of tax	8.0		8.0				8.0					0.0	8.0		8.0			8.0
Other comprehensive income (loss), net of tax	$ 5.2		5.2						5.2			0.0	5.2		5.2					5.2
Treasury stock repurchases (in shares)	0
Restricted stock issued and related tax withholdings	$ (0.1)		(0.1)			(0.1)
Share based compensation	8.6		8.6			8.6
Share based compensation													8.2		8.2		8.2
Dividends declared	(18.6)		(18.6)				(18.6)
Dividends paid to parent													(18.1)		(18.1)			(18.1)
Balances at Jun. 28, 2020	$ 1,385.5		$ 1,376.9		$ 0.5	$ 2,042.8	$ 217.3		$ (276.8)		$ (606.9)	$ 8.6	$ 1,237.9		$ 1,227.7		$ 2,142.9	$ (638.5)		$ (276.7)		$ 10.2
Balances, shares at Jun. 28, 2020					43,100,000