Statement Of Changes In Equity [Abstract]

Rockwool - Filing #1420466

Concept	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	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 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	2 398 EUR	—	—	2 394 EUR	1,000,000 EUR	—	102,000,000 EUR	—	2 394 EUR	- EUR	—	134,000,000 EUR	29,000,000 EUR	—	—	—	2 178 EUR	4,000,000 EUR	1,000,000 EUR	2 088 EUR	29,000,000 EUR	—	94,000,000 EUR	—	—	212,000,000 EUR	—	2 092 EUR	—	—	—	2 114 EUR	4,000,000 EUR	104,000,000 EUR	2 118 EUR	2 096 EUR	94,000,000 EUR	1,000,000 EUR	29,000,000 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	- EUR	—	- EUR	303,000,000 EUR	—	—	102,000,000 EUR	—	- EUR	—	—	- EUR	—	—	303,000,000 EUR	201,000,000 EUR	251,000,000 EUR	—	—	—	—	—	157,000,000 EUR	—	94,000,000 EUR	- EUR	—	- EUR	—	- EUR	- EUR	251,000,000 EUR	—	—	—	—	—	—	—	—
Other comprehensive income	- EUR	—	- EUR	104,000,000 EUR	—	—	- EUR	—	78,000,000 EUR	—	—	- EUR	—	—	104,000,000 EUR	26,000,000 EUR	107,000,000 EUR	—	—	—	—	—	1,000,000 EUR	—	- EUR	- EUR	—	- EUR	—	108,000,000 EUR	- EUR	107,000,000 EUR	—	—	—	—	—	—	—	—
Comprehensive income	- EUR	—	- EUR	407,000,000 EUR	—	—	102,000,000 EUR	—	78,000,000 EUR	—	—	- EUR	—	—	407,000,000 EUR	227,000,000 EUR	144,000,000 EUR	—	—	—	—	—	158,000,000 EUR	—	94,000,000 EUR	- EUR	—	- EUR	—	108,000,000 EUR	- EUR	144,000,000 EUR	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	- EUR	—	- EUR	93,000,000 EUR	—	—	94,000,000 EUR	—	- EUR	—	—	- EUR	—	—	93,000,000 EUR	1,000,000 EUR	94,000,000 EUR	—	—	—	—	—	- EUR	—	94,000,000 EUR	- EUR	—	- EUR	—	- EUR	- EUR	94,000,000 EUR	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	4,000,000 EUR	—	- EUR	4,000,000 EUR	—	—	- EUR	—	- EUR	—	—	- EUR	—	—	8,000,000 EUR	4,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	- EUR	—	- EUR	2,000,000 EUR	—	—	- EUR	—	- EUR	—	—	- EUR	—	—	2,000,000 EUR	2,000,000 EUR	2,000,000 EUR	—	—	—	—	—	2,000,000 EUR	—	- EUR	- EUR	—	- EUR	—	- EUR	- EUR	2,000,000 EUR	—	—	—	—	—	—	—	—