Commitments and Contingencies - Narrative (Details) - USD ($)						9 Months Ended	12 Months Ended
	Sep. 03, 2021	Aug. 03, 2021	Sep. 06, 2019	Mar. 11, 2019	May 10, 2018	Sep. 30, 2021	Dec. 31, 2018	Dec. 31, 2020	Aug. 12, 2019	Jun. 04, 2019	Dec. 28, 2017
Loss Contingencies [Line Items]
Other current assets						$ 154,400,000		$ 183,200,000
Loss contingency, damages sought						75,000,000.0
Loss contingency, barred from recovery, value	$ 9,000,000.0
Loss contingency, disgorgement, value	$ 10,000,000.0
Energy Labs
Loss Contingencies [Line Items]
Business combination, contingent consideration arrangements, range of outcomes, value, low											$ 0
Business combination, contingent consideration arrangements, range of outcomes, value, high											$ 34,500,000
Business combination, contingent consideration, liability										$ 0
Bladeroom Group Limited, Et Al
Loss Contingencies [Line Items]
Amount awarded to other party				$ 30,000,000.0	$ 30,000,000.0
Loss contingency accrual								96,200,000
Bladeroom Group Limited, Et Al | Indemnification Agreement
Loss Contingencies [Line Items]
Other current assets								96,200,000
Energy Labs
Loss Contingencies [Line Items]
Loss contingency accrual						2,800,000		$ 2,800,000
Loss contingency, damages sought			$ 34,500,000
Loss contingency, range of possible loss, portion not accrued						$ 31,700,000
Surety Bond | Bladeroom Group Limited, Et Al
Loss Contingencies [Line Items]
Estimate of possible loss									$ 120,100,000
Unremitted Payment
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 12,000,000.0
Damages and Injunctive Relief
Loss Contingencies [Line Items]
Loss contingency, damages sought							$ 18,000,000.0