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Acquisitions and Divestitures - Intangible Allocation (Detail) - USD ($) $ in Millions | Oct. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Intangible assets |  |  |
Other intangible assets |  | $ 53.0 | $ 141.0
Customer and supplier relationships [Member] |  |  |
Intangible assets |  |  |
Other intangible assets |  | 38.0 | 124.0
Covenants not-to-compete [Member] |  |  |
Intangible assets |  |  |
Other intangible assets |  | $ 15.0 | 16.0
Other Intangible Assets [Member] |  |  |
Intangible assets |  |  |
Other intangible assets |  |  | $ 1.0
Advanced Disposal [Member] |  |  |
Intangible assets |  |  |
Other intangible assets | $ 604.0 |  |
Advanced Disposal [Member] | Other Intangible Assets [Member] |  |  |
Intangible assets |  |  |
Other intangible assets | $ 29.0 |  |
Weighted average amortization periods | 7 years |  |
Advanced Disposal [Member] | Customer Relationships [Member] |  |  |
Intangible assets |  |  |
Other intangible assets | $ 575.0 |  |
Weighted average amortization periods | 15 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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