CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 5,519.7	$ 4,816.3	$ 15,854.0	$ 13,655.6
Cost of goods sold	4,360.3	3,886.4	12,894.3	11,223.2
Gross profit	1,159.4	929.9	2,959.7	2,432.4
Selling, general and administrative, excluding intangible amortization	504.3	450.9	1,450.3	1,327.1
Selling, general and administrative intangible amortization	87.5	88.8	263.6	269.3
(Gain) loss on disposal of assets	(0.2)	1.0	(11.6)	3.8
Multiemployer pension withdrawal income			(3.3)
Mineral rights impairment	26.0		26.0
Restructuring and other costs	0.6	6.9	366.3	19.8
Operating profit	541.2	382.3	868.4	812.4
Interest expense, net	(78.5)	(102.5)	(237.7)	(279.8)
Loss on extinguishment of debt			(8.2)	(1.1)
Pension and other postretirement non-service income	38.7	31.5	118.3	101.4
Other (expense) income, net	(7.2)	6.4	(0.7)	13.8
Equity in income of unconsolidated entities	18.3	10.7	57.3	29.4
Income before income taxes	512.5	328.4	797.4	676.1
Income tax expense	(132.7)	(77.4)	(193.1)	(158.2)
Consolidated net income	379.8	251.0	604.3	517.9
Less: Net income attributable to noncontrolling interests	(1.9)	(0.9)	(4.2)	(3.3)
Net income attributable to common stockholders	$ 377.9	$ 250.1	$ 600.1	$ 514.6
Basic earnings per share attributable to common stockholders	$ 1.48	$ 0.94	$ 2.30	$ 1.94
Diluted earnings per share attributable to common stockholders	$ 1.47	$ 0.93	$ 2.28	$ 1.93
Basic weighted average shares outstanding	255.6	266.5	261.2	264.7
Diluted weighted average shares outstanding	257.4	269.0	263.2	267.0