Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in Carrying Value

The following table represents our change in carrying value of intangible assets (in millions):

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Nine Months Ended September 30, 2023
Customer relationships, beginning of period	$	1,844.8	$	(923.6)	$	921.2
Amortization expense	—		(95.7)		(95.7)
Customer relationships, end of period	$	1,844.8	$	(1,019.3)	$	825.5

Schedule of Amortization Expense

The following table summarizes our estimated aggregate amortization expense for the next five years and thereafter (in millions):

2023 (remaining)	$	31.9
2024	127.6
2025	110.2
2026	106.3
2027	106.3
Thereafter	343.2
Total	$	825.5