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Business Combinations - Narrative (Details) £ in Millions, $ in Millions			3 Months Ended
	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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Business Acquisition, Pro Forma Labor and Related Expense

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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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.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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