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Business Combinations - Narrative (Details) $ in Thousands, £ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2020 USD ($) | Mar. 01, 2020 GBP (£) | Jan. 01, 2020 USD ($) | Jan. 01, 2020 GBP (£) | Dec. 31, 2020 USD ($) | Mar. 01, 2020 GBP (£) | Jan. 01, 2020 GBP (£) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 800,267 |  |  | $ 774,534
H G P E Capital Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership interest acquired | 100.00% |  |  |  |  | 100.00% |  |
Acquisition price | $ 20,400 | £ 15.9 |  |  |  |  |  |
Payments to acquire business | 14,300 | £ 11.2 |  |  |  |  |  |
Maximum contingent purchase price payments | 4,500 |  |  |  |  | £ 3.5 |  |
Revenue |  |  |  |  | 33,600 |  |  |
Net income |  |  |  |  | $ 5,300 |  |  |
Intangible Assets | 27,600 |  |  |  |  |  |  |
Goodwill | 19,100 |  |  |  |  |  |  |
Hermes G P E |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition-date fair value of previous equity interest | 34,500 |  |  |  |  |  |  |
Gain as a result of remeasuring prior equity interest | $ 7,500 |  |  |  |  |  |  |
M E P C Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition price |  |  | $ 13,100 | £ 9.9 |  |  |  |
Payments to acquire business |  |  | 5,900 | £ 4.4 |  |  |  |
Maximum contingent purchase price payments |  |  | 7,200 |  |  |  | £ 5.5 |
Intangible Assets |  |  | 7,300 |  |  |  |  |
Goodwill |  |  | $ 1,700 |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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