CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 4,236.3	$ 4,690.0	$ 13,107.3	$ 13,637.4
Cost of goods sold	3,466.3	3,701.1	10,723.5	10,967.1
Gross profit	770.0	988.9	2,383.8	2,670.3
Selling, general and administrative, excluding intangible amortization	390.1	442.4	1,234.4	1,287.4
Selling, general and administrative intangible amortization	99.6	102.4	301.5	297.7
Loss (gain) on disposal of assets	1.0	6.5	(5.9)	(37.3)
Multiemployer pension withdrawal income	(2.0)	(1.7)	(1.1)	(1.7)
Land and Development impairments				13.0
Restructuring and other costs	9.7	17.9	56.2	107.1
Operating profit	271.6	421.4	798.7	1,004.1
Interest expense, net	(92.4)	(111.1)	(283.2)	(317.3)
Loss on extinguishment of debt	(0.6)	(3.2)	(1.1)	(4.7)
Pension and other postretirement non-service income	25.6	18.9	78.4	54.9
Other (expense) income, net	(5.0)	3.7	(9.6)	(2.3)
Equity in income of unconsolidated entities		1.7	8.7	8.3
Income before income taxes	199.2	331.4	591.9	743.0
Income tax expense	(19.2)	(77.6)	(123.5)	(187.5)
Consolidated net income	180.0	253.8	468.4	555.5
Less: Net income attributable to noncontrolling interests	(1.5)	(1.2)	(3.3)	(3.4)
Net income attributable to common stockholders	$ 178.5	$ 252.6	$ 465.1	$ 552.1
Basic earnings per share attributable to common stockholders	$ 0.69	$ 0.98	$ 1.80	$ 2.15
Diluted earnings per share attributable to common stockholders	$ 0.69	$ 0.98	$ 1.79	$ 2.13
Basic weighted average shares outstanding	259.4	257.3	258.9	256.2
Diluted weighted average shares outstanding	260.4	258.6	260.2	259.1
Cash dividends paid per common share	$ 0.20	$ 0.455	$ 1.13	$ 1.365