Employer Sponsored Benefit Plans - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interface
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions during remainder of fiscal year	$ 1,200,000
Contributions made by company to domestic pension plan	400,000	$ 600,000
United States | Pension plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax settlement loss	$ 400,000
Contributions made by company to domestic pension plan		$ 0