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Income Taxes - Deferred Taxes in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Net | $ 156.8 | $ 136.0
Deferred Tax Assets, Net | 156.8 | 136.0
Other Noncurrent Liabilities [Member] |  |
Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Net | 1.5 | 2.1
Deferred Tax Assets, Net | 1.5 | 2.1
Other Noncurrent Assets [Member] |  |
Income Tax Disclosure [Abstract] |  |
Deferred Tax Assets, Net | 158.3 | 138.1
Deferred Tax Assets, Net | $ 158.3 | $ 138.1

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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, without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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