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Commitments and Contingencies - Narrative (Details) $ in Millions | Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($)
--- | --- | ---
Loss Contingencies [Line Items] |  |
Reserves for pending legal disputes, including commercial disputes and other matters | $ 17.2 | $ 14.0
Environmental reserves | $ 8.9 | $ 9.3
Percentage of employees that are members of trade union and employed under labor agreements | 47.00% |
Unionized workforce subject to labor agreement expiring in 2019 |  |
Loss Contingencies [Line Items] |  |
Percentage of employees that are members of trade union and employed under labor agreements | 85.00% |
Number of employees | employee | 82,500 |
Unionized workforce subject to labor agreement expiring in 2019 | United States and Canada |  |
Loss Contingencies [Line Items] |  |
Percentage of employees that are members of trade union and employed under labor agreements | 1.00% |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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