Statement Of Comprehensive Income [Abstract]

Rockwool - Filing #1420466

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Statement of comprehensive income [abstract]
Profit (loss)	- EUR	- EUR	- EUR	- EUR	303,000,000 EUR	102,000,000 EUR	303,000,000 EUR	201,000,000 EUR	157,000,000 EUR	- EUR	251,000,000 EUR	- EUR	- EUR	94,000,000 EUR	- EUR	251,000,000 EUR
Other comprehensive income [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract]
Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans	—	—	—	—	—	—	28,000,000 EUR	—	—	—	3,000,000 EUR	—	—	—	—	—
Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract]
Exchange differences on translation [abstract]
Gains (losses) on exchange differences on translation of foreign operations, before tax	—	—	—	—	—	—	78,000,000 EUR	—	—	—	108,000,000 EUR	—	—	—	—	—
Cash flow hedges [abstract]
Gains (losses) on cash flow hedges, before tax	—	—	—	—	—	—	- EUR	—	—	—	2,000,000 EUR	—	—	—	—	—
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract]
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss	—	—	—	—	—	—	2,000,000 EUR	—	—	—	4,000,000 EUR	—	—	—	—	—
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract]
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	—	—	—	—	—	—	- EUR	—	—	—	2,000,000 EUR	—	—	—	—	—
Other comprehensive income	- EUR	- EUR	- EUR	78,000,000 EUR	104,000,000 EUR	- EUR	104,000,000 EUR	26,000,000 EUR	1,000,000 EUR	- EUR	107,000,000 EUR	108,000,000 EUR	- EUR	- EUR	- EUR	107,000,000 EUR
Comprehensive income	- EUR	- EUR	- EUR	78,000,000 EUR	407,000,000 EUR	102,000,000 EUR	407,000,000 EUR	227,000,000 EUR	158,000,000 EUR	- EUR	144,000,000 EUR	108,000,000 EUR	- EUR	94,000,000 EUR	- EUR	144,000,000 EUR
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	407,000,000 EUR	—	—	—	144,000,000 EUR	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	- EUR	—	—	—	- EUR	—	—	—	—	—