CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 4,423.7	$ 4,327.4
Cost of goods sold	3,614.7	3,545.6
Selling, general and administrative, excluding intangible amortization	425.7	400.9
Selling, general and administrative intangible amortization	101.8	92.9
Gain on disposal of assets	(1.3)	(43.8)
Restructuring and other costs	30.1	54.4
Operating profit (loss)	252.7	277.4
Interest expense, net	(93.5)	(94.4)
Loss on extinguishment of debt		(1.9)
Pension and other postretirement non-service income	26.7	17.3
Other expense, net	(3.7)	(2.7)
Equity in income of unconsolidated entities	3.8	6.8
Income before income taxes	186.0	202.5
Income tax expense	(46.5)	(62.7)
Consolidated net income	139.5	139.8
Less: Net income attributable to noncontrolling interests	(1.0)	(0.7)
Net income attributable to common stockholders	$ 138.5	$ 139.1
Basic earnings per share attributable to common stockholders	$ 0.54	$ 0.55
Diluted earnings per share attributable to common stockholders	$ 0.53	$ 0.54
Basic weighted average shares outstanding	258.2	254.8
Diluted weighted average shares outstanding	259.9	259.5
Cash dividends paid per common share	$ 0.465	$ 0.455