Goodwill and intangible assets (Tables)

6 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table sets forth goodwill by segment as of October 1, 2020 and March 31, 2021:

	Americas		International		Total
Balance at October 1, 2020	$	865.8	$	150.2	$	1,016.0
Formulations Acquisition	29.2		—		29.2
Cumulative translation adjustment	0.4		11.9		12.3
Balance at March 31, 2021	$	895.4	$	162.1	$	1,057.5

Schedule of Finite-Lived Intangible Assets

Total intangible assets at March 31, 2021 are as follows:

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks and trade names	$	59.7	$	(15.8)	$	43.9
Customer relationships	395.2		(74.1)		321.1
Patents	34.5		(12.1)		22.4
Proprietary technology	172.5		(48.6)		123.9
Proprietary formulas	21.9		(1.5)		20.4
Non-compete	0.5		(0.5)		—
Vendor relationships	8.0		(3.4)		4.6
Total Amortizable intangible assets	692.3		(156.0)		536.3
Trademarks and trade names - indefinite lived	1,366.4		—		1,366.4
Total Other intangible assets, net	$	2,058.7	$	(156.0)	$	1,902.7

Total intangible assets at September 30, 2020 were as follows:

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks and trade names	$	59.7	$	(13.9)	$	45.8
Customer relationships	394.2		(60.8)		333.4
Patents	34.5		(10.8)		23.7
Proprietary technology	172.5		(37.6)		134.9
Proprietary formulas	2.4		(0.5)		1.9
Non-compete	0.5		(0.4)		0.1
Vendor relationships	5.0		(1.2)		3.8
Total Amortizable intangible assets	668.8		(125.2)		543.6
Trademarks and trade names - indefinite lived	1,365.4		—		1,365.4
Total Other intangible assets, net	$	2,034.2	$	(125.2)	$	1,909.0