Acquisitions - Discount Rates and Customer Attrition Rates Used to Determine Fair Value (Details) - Customer relationships	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Discount rates	22.00%
Customer attrition rates	25.00%
Minimum
Business Acquisition [Line Items]
Discount rates		19.00%
Customer attrition rates		10.00%
Maximum
Business Acquisition [Line Items]
Discount rates		25.00%
Customer attrition rates		43.00%
Weighted Average
Business Acquisition [Line Items]
Discount rates		20.00%
Customer attrition rates		13.00%