Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net Sales	$ 282.4	$ 244.0
Cost of goods sold	190.5	152.7
Gross Profit	91.9	91.3
Selling, general and administrative expenses	38.3	36.5
Amortization of intangible assets	5.9	5.5
Other operating income, net	(0.1)	0.0
Operating Profit	47.8	49.3
Interest expense, net	12.8	11.6
Earnings before Income Taxes	35.0	37.7
Income tax expense	2.1	5.9
Net Earnings Including Redeemable Noncontrolling Interest	32.9	31.8
Less: Net earnings attributable to redeemable noncontrolling interest	25.1	25.8
Net Earnings Available to Class A Common Stockholders	$ 7.8	$ 6.0
Earnings per Class A common share, basic (in usd per share)	$ 0.20	$ 0.15
Earnings per Class A common share, diluted (in usd per share)	$ 0.20	$ 0.15
Weighted Average Class A common shares outstanding, basic (in shares)	39.5	39.4
Weighted-Average Class A common shares outstanding, diluted (in shares)	39.6	39.4