Statement Of Changes In Equity [Abstract]

Rockwool - Filing #1442663

Concept	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2019-12-31	2019-01-01 to 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-12-31	2019-01-01 to 2019-12-31	2019-01-01 to 2019-12-31	As at 2019-01-01	As at 2019-01-01	As at 2019-01-01	As at 2019-01-01	As at 2019-01-01	As at 2019-01-01	As at 2019-01-01	As at 2019-01-01
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	2,178,000,000 EUR	4,000,000 EUR	1,000,000 EUR	2,088,000,000 EUR	29,000,000 EUR	—	94,000,000 EUR	—	—	212,000,000 EUR	—	2,092,000,000 EUR	—	—	—	29,000,000 EUR	2,096,000,000 EUR	1,000,000 EUR	2,118,000,000 EUR	94,000,000 EUR	4,000,000 EUR	104,000,000 EUR	2,114,000,000 EUR	2,114,000,000 EUR	—	—	4,000,000 EUR	104,000,000 EUR	—	—	2,118,000,000 EUR	2,096,000,000 EUR	—	94,000,000 EUR	1,000,000 EUR	—	29,000,000 EUR	—	—	1,000,000 EUR	29,000,000 EUR	1,912,000,000 EUR	1,877,000,000 EUR	4,000,000 EUR	88,000,000 EUR	1,873,000,000 EUR	157,000,000 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	251,000,000 EUR	—	—	—	—	—	157,000,000 EUR	—	94,000,000 EUR	- EUR	—	- EUR	—	- EUR	0 EUR	251,000,000 EUR	—	—	—	—	—	—	—	—	—	- EUR	285,000,000 EUR	—	—	191,000,000 EUR	0 EUR	—	—	285,000,000 EUR	—	—	- EUR	—	- EUR	94,000,000 EUR	—	—	—	—	—	—	—	—
Other comprehensive income	107,000,000 EUR	—	—	—	—	—	1,000,000 EUR	—	- EUR	0 EUR	—	- EUR	—	108,000,000 EUR	- EUR	107,000,000 EUR	—	—	—	—	—	—	—	—	—	53,000,000 EUR	44,000,000 EUR	—	—	7,000,000 EUR	0 EUR	—	—	44,000,000 EUR	—	—	2,000,000 EUR	—	- EUR	- EUR	—	—	—	—	—	—	—	—
Comprehensive income	144,000,000 EUR	—	—	—	—	—	158,000,000 EUR	—	94,000,000 EUR	0 EUR	—	- EUR	—	108,000,000 EUR	0 EUR	144,000,000 EUR	—	—	—	—	—	—	—	—	—	53,000,000 EUR	329,000,000 EUR	—	—	184,000,000 EUR	0 EUR	—	—	329,000,000 EUR	—	—	2,000,000 EUR	—	- EUR	94,000,000 EUR	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	94,000,000 EUR	—	—	—	—	—	0 EUR	—	94,000,000 EUR	- EUR	—	- EUR	—	- EUR	- EUR	94,000,000 EUR	—	—	—	—	—	—	—	—	—	- EUR	87,000,000 EUR	—	—	1,000,000 EUR	0 EUR	—	—	87,000,000 EUR	—	—	- EUR	—	- EUR	88,000,000 EUR	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	2,000,000 EUR	—	—	—	—	—	2,000,000 EUR	—	- EUR	- EUR	—	- EUR	—	- EUR	- EUR	2,000,000 EUR	—	—	—	—	—	—	—	—	—	- EUR	1,000,000 EUR	—	—	1,000,000 EUR	- EUR	—	—	1,000,000 EUR	—	—	- EUR	—	- EUR	- EUR	—	—	—	—	—	—	—	—