Goodwill and Other Intangible Assets (Schedule of goodwill) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, impairment loss	$ 0
Goodwill [Roll Forward]
Goodwill, beginning balance	3,848,391,000	$ 3,798,884,000
Accumulated impairments losses, beginning balance	(1,327,425,000)	(1,327,425,000)
Goodwill	2,570,027,000	2,520,966,000		$ 2,471,459,000
Goodwill recognized during the year	62,816,000	119,738,000
Currency translation during the year	(13,755,000)	(70,231,000)
Goodwill, ending balance	3,897,452,000	3,848,391,000
Accumulated impairments losses, ending balance	(1,327,425,000)	(1,327,425,000)
Goodwill, net, ending balance	2,570,027,000	2,520,966,000		2,471,459,000
Global Ceramic
Goodwill [Roll Forward]
Goodwill recognized during the year	13,197,000
Currency translation during the year	5,392,000
Flooring NA
Goodwill [Roll Forward]
Goodwill recognized during the year	0
Currency translation during the year	0
Flooring ROW
Goodwill [Roll Forward]
Goodwill			$ 12,874,000
Goodwill recognized during the year	49,619,000
Currency translation during the year	(19,147,000)
Goodwill, net, ending balance			$ 12,874,000
Operating segments | Global Ceramic
Goodwill [Roll Forward]
Goodwill, beginning balance	1,564,987,000	1,567,872,000
Accumulated impairments losses, beginning balance	(531,930,000)	(531,930,000)
Goodwill	1,051,646,000	1,033,057,000		1,035,942,000
Goodwill recognized during the year		19,821,000
Currency translation during the year		(22,706,000)
Goodwill, ending balance	1,583,576,000	1,564,987,000
Accumulated impairments losses, ending balance	(531,930,000)	(531,930,000)
Goodwill, net, ending balance	1,051,646,000	1,033,057,000		1,035,942,000
Operating segments | Flooring NA
Goodwill [Roll Forward]
Goodwill, beginning balance	874,198,000	869,764,000
Accumulated impairments losses, beginning balance	(343,054,000)	(343,054,000)
Goodwill	531,144,000	531,144,000		526,710,000
Goodwill recognized during the year		4,434,000
Currency translation during the year		0
Goodwill, ending balance	874,198,000	874,198,000
Accumulated impairments losses, ending balance	(343,054,000)	(343,054,000)
Goodwill, net, ending balance	531,144,000	531,144,000		526,710,000
Operating segments | Flooring ROW
Goodwill [Roll Forward]
Goodwill, beginning balance	1,409,206,000	1,361,248,000
Accumulated impairments losses, beginning balance	(452,441,000)	(452,441,000)
Goodwill	987,237,000	956,765,000		908,807,000
Goodwill recognized during the year		95,483,000
Currency translation during the year		(47,525,000)
Goodwill, ending balance	1,439,678,000	1,409,206,000
Accumulated impairments losses, ending balance	(452,441,000)	(452,441,000)
Goodwill, net, ending balance	$ 987,237,000	$ 956,765,000		$ 908,807,000