Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2020
Beneficial Owner
Related Party Transaction [Line Items]
Payables due to entities						$ 0.1
Operating lease, expense	$ 0.3	$ 0.3	$ 1.0	$ 1.0
Notes payable, related parties	$ 1.4		$ 1.4			1.9
Beneficial Owner | Lynn Frazier
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners	5.00%		5.00%
Forum Energy Technologies
Related Party Transaction [Line Items]
Billings to related party	$ 0.1	0.0	$ 0.3	0.4
Due to related party						0.1
Entity Owned By Forum Energy Technologies
Related Party Transaction [Line Items]
Billings to related party	0.7	0.9	4.6	3.0
Due to related party	0.3		0.3			0.9
Select Energy Services, Inc.
Related Party Transaction [Line Items]
Billings to related party	0.2	0.2	0.8	1.0
Due to related party	0.1		0.1			0.2
National Energy Services Reunited
Related Party Transaction [Line Items]
Accounts receivable	1.6		1.6			3.7
National Energy Services Reunited | Products and Rentals
Related Party Transaction [Line Items]
Billings to related party	0.3	0.2	1.3	1.4
National Energy Services Reunited | Coiled tubing
Related Party Transaction [Line Items]
Revenue from related parties					$ 5.9
Revenue number of monthly installments					24 months
Affiliated Entity
Related Party Transaction [Line Items]
Revenue from related parties	0.6	1.2	2.2	4.6
Due from related parties	0.3		0.3			0.4
Mr. Crombie
Related Party Transaction [Line Items]
Lease and building maintenance expense	0.2	0.2	0.6	0.6
Payments to acquire equipment	0.9	$ 0.8	1.7	$ 1.3
Mr. Crombie | Equipment
Related Party Transaction [Line Items]
Payables due to entities	$ 0.3		$ 0.3			$ 0.2