Goodwill and Other Intangibles (Tables)

9 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Progression of Goodwill by Reportable Segment

The following is a progression of goodwill by reportable segment: 

	Chemicals			Plastics			Other		Total
Balance at September 30, 2017	$	362.8		$	276.7		$	63.5	$	703.0
Foreign currency translation	(0.4		)	(2.0		)	—		(2.4		)
Balance at June 30, 2018	$	362.4		$	274.7		$	63.5	$	700.6

Schedule of Definite-Lived Intangible Assets

Definite-lived intangible assets at June 30, 2018 and September 30, 2017 consisted of the following:

		June 30, 2018							September 30, 2017
	Estimated Useful Life (years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Customer-related	5-13	$	239.8	$	(39.0	)	$	200.8	$	234.6	$	(23.7	)	$	210.9
Supplier-related	6-10	3.2		(0.3		)	2.9		1.5		(0.1		)	1.4
Trade name	2-10	23.3		(11.2		)	12.1		22.3		(7.0		)	15.3
Below-market leases	1-7	0.7		(0.5		)	0.2		0.7		(0.3		)	0.4
Non-compete agreements	3-10	4.6		(1.7		)	2.9		4.2		(0.7		)	3.5
Total		$	271.6	$	(52.7	)	$	218.9	$	263.3	$	(31.8	)	$	231.5

Schedule of Amortization Expense

Amortization expense recognized on the intangible assets described above was as follows:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2018		2017		2018		2017
Amortization expense	$	7.1	$	6.7	$	21.0	$	18.0