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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax Credit Carryforward [Line Items] |  |  |  |
CARES Act Tax Benefit |  | $ 7.0 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  | 0.0 | $ 0.0 | $ 41.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | 7.0 | 0.0 | 0.0
Deferred Tax Assets, Valuation Allowance |  | 5.4 | 5.3 |
Change in valuation allowance |  | 0.1 | 2.3 | 0.0
Unrecognized tax benefits , if recognized, would favorably impact effective tax rate |  | 6.4 | 3.5 | $ 2.8
Accrued interest related to tax obligations |  | 0.1 |  |
Federal and state credit carryforwards |  | 16.2 | 10.3 |
Investment Tax Credit |  | 0.3 | 1.3 |
Deferred Income Tax Assets, Net | [1] | 2.1 | 3.8 |
Deferred Income Tax Liabilities, Net |  | (158.1) | $ (121.3) |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | $ 1.5 |  |
Deferred Tax Assets, Valuation Allowance Expirations [Domain] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Explanation of Change |  | 0.8 million |  |
Valuation allowances, State Tax Credits [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Change in valuation allowance |  | $ (8.8) |  |
[1] | Included in "Other assets, net" on our accompanying December 31, 2020 and 2019 Consolidated Balance Sheets.

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120406818&loc=d3e31917-109318 + Details
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