Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Changes in goodwill

Goodwill

The following table sets forth the change in the carrying amount of goodwill during the years ended September 30, 2020 and 2019, respectively (in millions): 

Balance as of September 30, 2018	$	2,491.8
Acquisitions1		(0.5	)
Translation and other adjustments		(0.7	)
Balance as of September 30, 2019	$	2,490.6
Balance as of September 30, 2019	$	2,490.6
Translation and other adjustments		(0.2	)
Balance as of September 30, 2020	$	2,490.4

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¹  Reflects purchase accounting adjustments related to fiscal year 2018 acquisition of Atlas Supply, Inc. (see Note 3 for further discussion).

Summary of Intangible Assets

The following table summarizes intangible assets by category (in millions, except time period amounts):

	September 30,						Weighted- Average Remaining Life1
	2020			2019			(Years)
Amortizable intangible assets:
Non-compete agreements	$	0.2		$	2.8			1.7
Customer relationships		1,481.1			1,530.9			16.4
Trademarks		7.2			10.5			6.1
Beneficial lease arrangements		—			8.1			—
Total amortizable intangible assets		1,488.5			1,552.3
Accumulated amortization		(738.6	)		(619.9	)
Total amortizable intangible assets, net	$	749.9		$	932.4
Indefinite-lived trademarks		51.3			193.1
Total intangibles, net	$	801.2		$	1,125.5

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¹ As of September 30, 2020.

Summary of Estimated Future Amortization

The following table summarizes the estimated future amortization expense for intangible assets (in millions):

Year Ending September 30,
2021	$	147.9
2022		120.4
2023		97.3
2024		78.7
2025		63.6
Thereafter		242.0
Total future amortization expense	$	749.9