Business Combinations (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Dec. 08, 2020	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill acquired on acquisition		$ 838,798	$ 840,610
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average amortization period	15 years
Software and technology assets [Member]
Business Acquisition [Line Items]
Weighted average amortization period	4 years
Trade Names and Trademarks [Member]
Business Acquisition [Line Items]
Weighted average amortization period	2 years
Rouse Services LLC [Member]
Business Acquisition [Line Items]
Purchase price	$ 250,996
Cash and cash equivalents	226
Trade and other receivables	4,601
Other current assets	159
Property, plant and equipment	1,171
Other non-current assets	3,741
Deferred tax assets	7,584
Intangible assets	79,300
Trade and other payables	5,630
Other non-current liabilities	3,188
Deferred tax liabilities	936
Fair value of identifiable net assets acquired	87,028
Goodwill acquired on acquisition	$ 163,968
Weighted average amortization period	13 years 9 months 18 days
Rouse Services LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets	$ 71,000
Rouse Services LLC [Member] | Software and technology assets [Member]
Business Acquisition [Line Items]
Intangible assets	7,500
Rouse Services LLC [Member] | Trade Names and Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets	$ 800