Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net (loss) income	$ 473.2	$ 872.0	$ 273.2
Income (loss) from discontinued operations, net of tax	659.9	445.0	289.3
Net (loss) income from continuing operations	(186.7)	427.0	(16.1)
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	180.8	125.3	147.3
Share based compensation	49.2	11.9	54.2
Unrealized loss on investments	12.1
Write-off from impairment of goodwill	116.0
Write-off from impairment of intangible assets	35.4	20.3	16.3
Amortization of debt issuance costs and debt discount	9.9	19.6	17.4
Write-off of unamortized discount and debt issuance costs	38.3		2.6
Purchase accounting inventory adjustment		0.8	3.3
GPC safety recall inventory write-off		4.1	15.0
Dividends from subsidiaries classified as discontinued operations		3.1	12.2
Deferred tax benefit	(6.5)	(556.5)	(32.5)
Net changes in operating assets and liabilities
Receivables	(70.6)	21.4	(28.8)
Inventories	26.7	(9.2)	(24.5)
Prepaid expenses and other current assets	(3.1)	22.3	(7.9)
Accounts payable and accrued liabilities	(161.3)	65.7	148.9
Other	43.3	(38.7)	(31.3)
Net cash provided by operating activities from continuing operations	83.5	117.1	276.1
Net cash (used) provided by operating activities from discontinued operations	(82.4)	226.2	564.1
Net cash provided (used) by operating activities	1.1	343.3	840.2
Cash flows from investing activities
Purchases of property, plant and equipment	(58.4)	(75.9)	(81.8)
Proceeds from disposal of property, plant and equipment	2.1	4.2	4.6
Proceeds from sale of discontinued operations, net of cash	2,859.5	1,546.8
Business acquisitions, net of cash acquired			(289.4)
Net asset based on repayments			30.9
Other investing activity	(0.3)	(0.5)	(2.8)
Net cash provided (used) by investing activities from continuing operations	2,802.9	1,474.6	(338.5)
Net cash used by investing activities from discontinued operations	(5.3)	(201.9)	(1,248.7)
Net cash provided (used) by investing activities	2,797.6	1,272.7	(1,587.2)
Cash flows from financing activities
Payment of debt, including premium on extinguishment	(2,649.9)	(1,075.9)	(257.7)
Proceeds from issuance of debt	300.0	19.6	315.6
Payment of debt issuance costs	(4.1)	(0.4)	(7.0)
Treasury stock purchases	(268.5)
Purchases of subsidiary stock, net		(288.0)	(252.5)
Dividends paid to shareholders	(85.5)	(22.4)
Dividends paid by subsidiary to non-controlling interest	(1.1)	(28.6)	(39.9)
Purchase of non-controlling interest			(12.6)
Share based award tax withholding payments, net of proceeds upon vesting	(4.4)	(24.3)	(40.8)
Payment of contingent consideration	(8.9)	(6.4)
Other financing activities, net		20.7	6.5
Net cash (used) provided by financing activities from continuing operations	(2,722.4)	(1,405.7)	(288.4)
Net cash (used) provided by financing activities from discontinued operations	(2.2)	110.4	871.4
Net cash (used) provided by financing activities	(2,724.6)	(1,295.3)	583.0
Effect of exchange rate changes on cash and cash equivalents on Venezuela devaluation			(0.4)
Effect of exchange rate changes on cash and cash equivalents	(8.4)	(7.0)	3.1
Net change in cash, cash equivalents and restricted cash	65.7	313.7	(161.3)
Net change in cash, cash equivalents and restricted cash in discontinued operations		37.7	18.5
Net change in cash, cash equivalents and restricted cash in continuing operations	65.7	276.0	(179.8)
Cash, cash equivalents, and restricted cash, beginning of period	561.4	285.4	465.2
Cash, cash equivalents, and restricted cash, end of period	627.1	561.4	285.4
Supplemental disclsoure of cash flow information
Cash paid for interest	208.1	314.1	323.5
Cash paid for taxes	53.9	53.8	37.5
Non cash investing activities
Acquisition of property, plant and equipment through capital leases	3.5	4.5	106.0
Non cash financing activities
Issuance of shares through stock compensation plan	30.8	63.7	54.5
SB/RH [Member]
Cash flows from operating activities
Net (loss) income	520.0	182.9	301.2
Income (loss) from discontinued operations, net of tax	659.9	(24.0)	119.0
Net (loss) income from continuing operations	(139.9)	206.9	182.2
Adjustments to reconcile net (loss) income to net cash from operating activities:
Depreciation and amortization	180.8	124.6	146.8
Share based compensation	47.6	8.8	46.2
Unrealized loss on investments	12.1
Write-off from impairment of goodwill	116.0
Write-off from impairment of intangible assets	35.4	20.3	16.3
Amortization of debt issuance costs and debt discount	6.4	8.9	8.0
Write-off of unamortized discount and debt issuance costs	14.4		2.5
Purchase accounting inventory adjustment		0.8	3.3
GPC safety recall inventory write-off		4.1	15.0
Deferred tax benefit	11.3	(170.9)	(26.6)
Net changes in operating assets and liabilities
Receivables	(92.9)	(29.7)	(28.8)
Inventories	26.7	(9.2)	(24.5)
Prepaid expenses and other current assets	(3.5)	22.3	(7.2)
Accounts payable and accrued liabilities	(156.6)	69.5	140.4
Other	39.4	(32.7)	(29.6)
Net cash provided by operating activities from continuing operations	97.2	223.7	444.0
Net cash (used) provided by operating activities from discontinued operations	(82.4)	128.8	203.6
Net cash provided (used) by operating activities	14.8	352.5	647.6
Cash flows from investing activities
Purchases of property, plant and equipment	(58.4)	(75.9)	(81.8)
Proceeds from disposal of property, plant and equipment	2.1	4.2	4.6
Proceeds from sale of discontinued operations, net of cash	2,859.5
Business acquisitions, net of cash acquired			(289.4)
Other investing activity	(0.3)	(0.5)	(2.8)
Net cash provided (used) by investing activities from continuing operations	2,802.9	(72.2)	(369.4)
Net cash used by investing activities from discontinued operations	(5.3)	(27.0)	(31.9)
Net cash provided (used) by investing activities	2,797.6	(99.2)	(401.3)
Cash flows from financing activities
Payment of debt, including premium on extinguishment	(2,262.7)	(69.3)	(229.2)
Proceeds from issuance of debt	300.0	539.6	265.6
Payment of debt issuance costs	(4.1)	(0.4)	(5.9)
Payment of cash dividends to parent	(717.4)	(374.2)	(350.8)
Dividends paid by subsidiary to non-controlling interest	(1.1)
Purchase of non-controlling interest			(12.6)
Other financing activities, net	(8.9)	(6.4)
Net cash (used) provided by financing activities from continuing operations	(2,694.2)	89.3	(332.9)
Net cash (used) provided by financing activities from discontinued operations	(2.2)	(4.8)	(3.4)
Net cash (used) provided by financing activities	(2,696.4)	84.5	(336.3)
Effect of exchange rate changes on cash and cash equivalents on Venezuela devaluation			(0.4)
Effect of exchange rate changes on cash and cash equivalents	(8.4)	(7.0)	3.1
Net change in cash, cash equivalents and restricted cash	107.6	330.8	(87.3)
Cash, cash equivalents, and restricted cash, beginning of period	514.3	183.5	270.8
Cash, cash equivalents, and restricted cash, end of period	621.9	514.3	183.5
Supplemental disclsoure of cash flow information
Cash paid for interest	179.9	208.4	184.9
Cash paid for taxes	53.9	53.8	37.5
Non cash investing activities
Acquisition of property, plant and equipment through capital leases	$ 3.5	$ 4.5	$ 106.0