Goodwill and intangible assets (Tables)

12 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table represents the change in the carrying amount of goodwill at September 30, 2018 and 2017:

	Americas			International			Total
Balance at September 30, 2016	$	213.7		$	16.0		$	229.7
Cumulative translation adjustment	0.1			0.2			0.3
Balance at September 30, 2017	$	213.8		$	16.2		$	230.0
Nu Finish acquisition	14.7			—			14.7
Cumulative translation adjustment	(0.1		)	(0.4		)	$	(0.5	)
Balance at September 30, 2018	$	228.4		$	15.8		$	244.2

Schedule of Finite-Lived Intangible Assets

Total amortizable intangible assets at September 30, 2018 and 2017, respectively, are as follows:

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks	$	44.3	$	6.1	$	38.2
Customer Relationships	99.6		13.4		86.2
Patents	34.5		5.7		28.8
Proprietary formulas	2.4		0.1		2.3
Non-Compete	0.5		0.2		0.3
Total Intangible Assets at September 30, 2018	$	181.3	$	25.5	$	155.8

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks	$	40.1	$	3.4	$	36.7
Customer Relationships	84.4		7.3		77.1
Patents	34.5		3.2		31.3
Non-Compete	0.5		0.1		0.4
Total Intangible Assets at September 30, 2017	$	159.5	$	14.0	$	145.5