Goodwill and Intangible Assets (Tables)

9 Months Ended

Jun. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Changes in goodwill

The following table sets forth the change in the carrying amount of goodwill during the nine months ended June 30, 2021 and 2020, respectively (in millions):

Balance as of September 30, 2020	$	1,756.1
Translation and other adjustments		5.6
Balance as of June 30, 2021	$	1,761.7
Balance as of September 30, 2019	$	1,756.3
Translation and other adjustments		(0.8	)
Balance as of June 30, 2020	$	1,755.5

Summary of Intangible Assets

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

	June 30, 2021			September 30, 2020			June 30, 2020			Weighted-Average Remaining Life1 (Years)
Amortizable intangible assets:
Non-compete agreements	$	0.2		$	0.2		$	0.2			0.9
Customer relationships		1,086.1			1,085.5			1,087.7			28.5
Trademarks		—			3.7			3.7			—
Total amortizable intangible assets		1,086.3			1,089.4			1,091.6
Accumulated amortization		(656.3	)		(581.2	)		(553.2	)
Total amortizable intangible assets, net		430.0			508.2			538.4
Indefinite-lived trademarks		9.8			9.8			9.8
Total intangibles, net	$	439.8		$	518.0		$	548.2

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¹ As of June 30, 2021.

Summary of Estimated Future Amortization

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

Year Ending September 30,
2021 (Jul - Sept)	$	25.0
2022		82.1
2023		66.2
2024		53.1
2025		42.8
Thereafter		160.8
Total future amortization expense	$	430.0