Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net Sales	$ 282.1	$ 257.5	$ 564.5	$ 501.5
Cost of goods sold	195.1	169.3	385.6	322.0
Gross Profit	87.0	88.2	178.9	179.5
Selling, general and administrative expenses	48.2	47.5	86.5	84.0
Amortization of intangible assets	23.2	5.6	29.1	11.1
Other operating income, net	0.0	0.0	(0.1)	0.0
Operating Profit	15.6	35.1	63.4	84.4
Interest expense, net	11.3	14.3	24.1	25.9
Loss on refinancing of debt	1.5	0.0	1.5	0.0
Earnings before Income Taxes	2.8	20.8	37.8	58.5
Income tax expense	0.3	2.2	2.4	8.1
Net Earnings Including Redeemable Noncontrolling Interest	2.5	18.6	35.4	50.4
Less: Net earnings attributable to redeemable noncontrolling interest	1.9	14.4	27.0	40.2
Net Earnings Available to Class A Common Stockholders	$ 0.6	$ 4.2	$ 8.4	$ 10.2
Earnings per Class A common share, basic (in usd per share)	$ 0.02	$ 0.11	$ 0.21	$ 0.26
Earnings per Class A common share, diluted (in usd per share)	$ 0.02	$ 0.11	$ 0.21	$ 0.26
Weighted Average Class A common shares outstanding, basic (in shares)	39.5	39.4	39.5	39.4
Weighted-Average Class A common shares outstanding, diluted (in shares)	39.7	39.5	39.6	39.4