CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 17,578.8	$ 18,289.0	$ 16,285.1
Cost of goods sold	14,381.6	14,540.0	12,923.1
Gross profit	3,197.2	3,749.0	3,362.0
Selling, general and administrative, excluding intangible amortization	1,624.4	1,715.2	1,546.6
Selling, general and administrative intangible amortization	400.5	400.2	296.6
(Gain) loss on disposal of assets	(16.3)	(41.2)	10.1
Multiemployer pension withdrawal (income) expense	(1.1)	(6.3)	184.2
Land and Development impairments		13.0	31.9
Restructuring and other costs	112.7	173.7	105.4
Goodwill impairment	1,333.2
Operating (loss) profit	(256.2)	1,494.4	1,187.2
Interest expense, net	(393.5)	(431.3)	(293.8)
Loss on extinguishment of debt	(1.5)	(5.1)	(0.1)
Pension and other postretirement non-service income	103.3	74.2	95.3
Other income, net	9.5	2.4	12.7
Equity in income of unconsolidated entities	15.8	10.1	33.5
(Loss) income before income taxes	(522.6)	1,144.7	1,034.8
Income tax (expense) benefit	(163.5)	(276.8)	874.5
Consolidated net (loss) income	(686.1)	867.9	1,909.3
Less: Net income attributable to noncontrolling interests	(4.8)	(5.0)	(3.2)
Net (loss) income attributable to common stockholders	$ (690.9)	$ 862.9	$ 1,906.1
Basic (loss) earnings per share attributable to common stockholders	$ (2.67)	$ 3.36	$ 7.46
Diluted (loss) earnings per share attributable to common stockholders	(2.67)	3.33	7.34
Cash dividends paid per share	$ 1.33	$ 1.82	$ 1.72