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Business Combinations - Narrative (Details) £ in Millions, $ in Millions |  | 3 Months Ended |
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Mar. 01, 2020 GBP (£) | Mar. 01, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 01, 2020 USD ($)
HCL |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership interest acquired | 100.00% |  |  |  | 100.00%
Acquisition price | £ 15.9 | $ 20.4 |  |  |
Payments to acquire business | 11.2 | 14.3 |  |  |
Maximum contingent purchase price payments | £ 3.5 |  |  |  | $ 4.5
Business combination, provisional information adjustments, assets |  |  | $ 25.8 |  |
Business combination, provisional information adjustments, liabilities |  |  | 17.2 |  |
Business combination, provisional information adjustments, equity interests |  |  | 8.6 |  |
Revenue |  |  | 6.9 |  |
Compensation and related expense |  |  | $ 6.9 |  |
HGPE |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition-date fair value of previous equity interest |  | $ 34.5 |  |  |
Gain as a result of remeasuring prior equity interest |  |  |  | $ 7.5 |

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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 The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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