Restructuring, acquisition and integration-related costs - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	$ 24,654		$ 4,259
Restructuring costs	26,338		100,087
Cash payments	(11,154)		(22,513)
Non-cash items	(18,292)		(60,287)
Balance as of September 26, 2020	21,546		21,546
Cost of sales
Restructuring Reserve [Roll Forward]
Restructuring costs	17,711	$ 7,284	78,383	$ 43,197
Selling, general and administrative expenses
Restructuring Reserve [Roll Forward]
Restructuring costs	8,627	$ 491	21,704	$ 2,336
Lease impairments
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	5		21
Restructuring costs	1,389		1,389
Cash payments	(5)		(21)
Non-cash items	(1,389)		(1,389)
Balance as of September 26, 2020	0		0
Lease impairments | Cost of sales
Restructuring Reserve [Roll Forward]
Restructuring costs	0		0
Lease impairments | Selling, general and administrative expenses
Restructuring Reserve [Roll Forward]
Restructuring costs	1,389		1,389
Asset write-downs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	0		0
Restructuring costs	14,474		54,329
Cash payments	0		0
Non-cash items	(14,474)		(54,329)
Balance as of September 26, 2020	0		0
Asset write-downs | Cost of sales
Restructuring Reserve [Roll Forward]
Restructuring costs	9,758		49,613
Asset write-downs | Selling, general and administrative expenses
Restructuring Reserve [Roll Forward]
Restructuring costs	4,716		4,716
Severance
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	24,186		4,122
Restructuring costs	2,786		28,618
Cash payments	(6,666)		(12,283)
Non-cash items	577		426
Balance as of September 26, 2020	20,883		20,883
Severance | Cost of sales
Restructuring Reserve [Roll Forward]
Restructuring costs	1,068		15,127
Severance | Selling, general and administrative expenses
Restructuring Reserve [Roll Forward]
Restructuring costs	1,718		13,491
Other restructuring costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	463		116
Restructuring costs	7,689		15,751
Cash payments	(4,483)		(10,209)
Non-cash items	(3,006)		(4,995)
Balance as of September 26, 2020	663		663
Other restructuring costs | Cost of sales
Restructuring Reserve [Roll Forward]
Restructuring costs	6,885		13,643
Other restructuring costs | Selling, general and administrative expenses
Restructuring Reserve [Roll Forward]
Restructuring costs	804		2,108
Provision - Corporate
Restructuring Reserve [Roll Forward]
Restructuring costs	4,249		5,508
Provision - Corporate | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0		0
Provision - Corporate | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	3,685		3,685
Provision - Corporate | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	564		1,823
Provision - Corporate | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	0		0
Operating segments | Global Ceramic segment
Restructuring Reserve [Roll Forward]
Restructuring costs	14,254		31,137
Operating segments | Global Ceramic segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	1,389		1,389
Operating segments | Global Ceramic segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	7,758		12,383
Operating segments | Global Ceramic segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	2,170		14,123
Operating segments | Global Ceramic segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	2,937		3,242
Operating segments | Provision - Flooring NA segment
Restructuring Reserve [Roll Forward]
Restructuring costs	5,952		42,947
Operating segments | Provision - Flooring NA segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0		0
Operating segments | Provision - Flooring NA segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	2,627		28,959
Operating segments | Provision - Flooring NA segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	54		5,036
Operating segments | Provision - Flooring NA segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	3,271		8,952
Operating segments | Provision - Flooring ROW segment
Restructuring Reserve [Roll Forward]
Restructuring costs	1,883		20,495
Operating segments | Provision - Flooring ROW segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0		0
Operating segments | Provision - Flooring ROW segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	404		9,302
Operating segments | Provision - Flooring ROW segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	(2)		7,636
Operating segments | Provision - Flooring ROW segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	$ 1,481		$ 3,557