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Restructuring - Rollforward Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges | $ 0 | $ 18,089,000 | $ 0 | $ 18,089,000 |  |  |
Resource rationalization, 2020 |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges | 0 |  | 0 |  | $ 18,089,000 |  |
Utilization |  |  | (3,644,000) |  | (8,296,000) |  |
Foreign exchange movement |  |  | 4,000 |  | 325,000 |  |
Provision balance | 6,478,000 |  | 6,478,000 |  | 10,118,000 |  |
Resource rationalization, 2020 | Workforce reductions |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 11,391,000 |  |
Utilization |  |  | (2,299,000) |  | (6,987,000) |  |
Foreign exchange movement |  |  | 0 |  | 0 |  |
Provision balance | 2,105,000 |  | 2,105,000 |  | 4,404,000 |  |
Resource rationalization, 2020 | Onerous Lease |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 6,698,000 |  |
Utilization |  |  | (1,345,000) |  | (1,309,000) |  |
Foreign exchange movement |  |  | 4,000 |  | 325,000 |  |
Provision balance | 4,373,000 |  | 4,373,000 |  | 5,714,000 |  |
Resource rationalizations 2018 |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges |  |  | 0 |  |  |  | $ 12,490,000
Utilization |  |  | (97,000) |  | (1,007,000) | $ (4,782,000) | (6,071,000)
Provision balance | 533,000 |  | 533,000 |  | 630,000 | 1,637,000 | 6,419,000
Resource rationalizations 2018 | Workforce reductions |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  | 9,684,000
Utilization |  |  | 0 |  | (731,000) | (3,554,000) | (5,399,000)
Provision balance | 0 |  | 0 |  | 0 | 731,000 | 4,285,000
Resource rationalizations 2018 | Onerous Lease |  |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  | 2,806,000
Utilization |  |  | (97,000) |  | (276,000) | (1,228,000) | (672,000)
Provision balance | $ 533,000 |  | $ 533,000 |  | $ 630,000 | $ 906,000 | $ 2,134,000

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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