Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The components of our income tax expense are as follows (in millions):

	Year Ended December 31,
	2021		2020		2019
Current income tax expense	$	(0.8)	$	(1.1)	$	—
Deferred tax expense	(24.6)		(142.1)		(6.9)
Total income tax expense	$	(25.4)	$	(143.2)	$	(6.9)

Reconciliation of Total Income Tax Expense to Income before Income Taxes

The following schedule reconciles total income tax expense and the amount calculated by applying the statutory U.S. federal tax rate to income before income taxes (in millions):

	Year Ended December 31,
	2021		2020		2019
Expected income tax benefit (expense) based on federal statutory tax rate	$	(10.0)	$	58.5	$	233.6
State income tax benefit (expense), net of federal benefit	(1.4)		6.5		27.0
Unit-based compensation (1)	(3.1)		(6.0)		(2.2)
Non-deductible expense related to impairments	—		(43.4)		(264.5)
Statutory rate changes (2)(3)	(10.2)		—		—
Change in valuation allowance (3)	1.7		(153.3)		—
Other	(2.4)		(5.5)		(0.8)
Total income tax expense	$	(25.4)	$	(143.2)	$	(6.9)

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(1)Related to book-to-tax differences recorded upon the vesting of restricted incentive units.

(2)Effective January 1, 2022, Oklahoma House Bill 2960 resulted in a change in the corporate income tax rate from 6% to 4% and Louisiana Senate Bill No. 159 resulted in a change in the corporate income tax rate from 8% to 7.5%. Accordingly, we recorded deferred tax expense related to our Oklahoma and Louisiana operations in the amount of $7.6 million and $2.6 million, respectively, for the year ended December 31, 2021 due to a remeasurement of deferred tax assets.

(3)Includes the remeasurement of the state deferred tax liabilities, but were partially offset by a change in state apportionment, and its impact on the valuation allowance for the year ended December 31, 2021.

Schedule of Deferred Tax Assets and Liabilities

ur deferred income tax assets and liabilities as of December 31, 2021 and 2020 are as follows (in millions):

	December 31, 2021		December 31, 2020
Deferred income tax assets:
Federal net operating loss carryforward	$	573.6	$	488.3
State net operating loss carryforward	59.6		61.0
Total deferred tax assets, gross	633.2		549.3
Valuation allowance	(151.6)		(153.3)
Total deferred tax assets, net of valuation allowance	481.6		396.0
Deferred tax liabilities:
Property, plant, equipment, and intangible assets (1)	(619.1)		(504.6)
Total deferred tax liabilities	(619.1)		(504.6)
Deferred tax liability, net	$	(137.5)	$	(108.6)

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(1)Includes our investment in ENLK and primarily relates to differences between the book and tax bases of property and equipment.