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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The components of our income tax benefit (expense) are as follows (in millions):
Three Months Ended
March 31,
20212020
Current income tax expense$(0.1)$(0.3)
Deferred income tax benefit (expense)(1.3)34.0 
Income tax benefit (expense)$(1.4)$33.7 
Reconciliation of Total Income Tax Expense to Income before Income Taxes
The following schedule reconciles total income tax benefit (expense) and the amount calculated by applying the statutory U.S. federal tax rate to income (loss) before income taxes (in millions):
Three Months Ended
March 31,
20212020
Expected income tax benefit based on federal statutory rate$2.4 $67.3 
State income tax benefit, net of federal benefit0.2 8.0 
Unit-based compensation (1)(2.5)2.4 
Non-deductible expense related to goodwill impairment— (43.4)
Change in valuation allowance(1.2)— 
Other(0.3)(0.6)
Income tax benefit (expense)$(1.4)$33.7 
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(1)Related to book-to-tax differences recorded upon the vesting of restricted incentive units.