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Revenues - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019 country customer	Jun. 30, 2018
Concentration Risk [Line Items]
Number of customers | customer			500
Number of countries in which customers are located (more than) | country			40
Length of contract terms			We typically sell to customers under master service agreements, with one- to two-year terms on average, or by purchase orders.
Duration of customer relationship			20 years
10 Largest Customers | Customer Concentration Risk | Revenue from Contract with Customer
Concentration Risk [Line Items]
Concentration risk percentage	47.00%	45.00%	46.00%	45.00%
Shaw Industries Group Inc | Customer Concentration Risk | Revenue from Contract with Customer
Concentration Risk [Line Items]
Concentration risk percentage	19.00%	22.00%	21.00%	22.00%

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