Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table represents our change in carrying value of goodwill by segment (in millions):

	Permian		North Texas		Oklahoma		Louisiana		Corporate		Totals
Three Months Ended March 31, 2020
Balance, beginning of period	$	184.6	$	—	$	—	$	—	$	—	$	184.6
Impairment	(184.6)		—		—		—		—		(184.6)
Balance, end of period	$	—	$	—	$	—	$	—	$	—	$	—

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
Three Months Ended March 31, 2020
Customer relationships, beginning of period	$	1,795.8	$	(545.9)	$	1,249.9
Amortization expense	—		(30.9)		(30.9)
Customer relationships, end of period	$	1,795.8	$	(576.8)	$	1,219.0

Schedule of Amortization Expense

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

2020 (remaining)	$	92.8
2021	123.7
2022	123.7
2023	123.6
2024	123.4
Thereafter	631.8
Total	$	1,219.0