Statement Of Changes In Equity [Abstract]

Aperam S.A. - Filing #4417767

Concept	2021-01-01 to 2021-12-31	As at 2021-12-31	As at 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	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	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	2020-01-01 to 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	As at 2020-12-31	2020-01-01 to 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 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	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	—	106,000,000 EUR	2,253,000,000 EUR	7,000,000 EUR	1,097,000,000 EUR	—	—	—	2,953,000,000 EUR	— EUR	—	2,000,000 EUR	—	2,945,000,000 EUR	8,000,000 EUR	—	713,000,000 EUR	419,000,000 EUR	—	—	—	—	1,424,000,000 EUR	22,000,000 EUR	4,000,000 EUR	1,098,000,000 EUR	—	2,200,000,000 EUR	419,000,000 EUR	—	4,000,000 EUR	718,000,000 EUR	—	— EUR	2,204,000,000 EUR	—	3,000,000 EUR	—	—	20,000,000 EUR	2,414,000,000 EUR	4,000,000 EUR	463,000,000 EUR	1,189,000,000 EUR	2,418,000,000 EUR	— EUR	1,389,000,000 EUR	117,000,000 EUR	438,000,000 EUR	2,000,000 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	1,000,000 EUR	—	—	—	—	—	—	968,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	969,000,000 EUR	968,000,000 EUR	175,000,000 EUR	—	—	—	—	—	—	—	175,000,000 EUR	—	—	—	—	—	—	—	175,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	15,000,000 EUR	19,000,000 EUR	—	—	5,000,000 EUR	—	1,000,000 EUR	—	—	—	—	—	—	19,000,000 EUR	—	252,000,000 EUR	—	—	—	—	—	—	—	—	—	—	2,000,000 EUR	—	—	255,000,000 EUR	—	252,000,000 EUR	5,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	1,000,000 EUR	—	—	—	—	—	15,000,000 EUR	987,000,000 EUR	—	—	5,000,000 EUR	—	1,000,000 EUR	—	—	—	—	—	—	988,000,000 EUR	968,000,000 EUR	77,000,000 EUR	—	—	—	—	—	—	—	175,000,000 EUR	—	—	2,000,000 EUR	—	—	255,000,000 EUR	—	77,000,000 EUR	5,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	1,000,000 EUR	—	—	—	—	—	—	139,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	140,000,000 EUR	139,000,000 EUR	140,000,000 EUR	—	—	—	—	—	—	—	140,000,000 EUR	—	—	—	—	—	—	—	140,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—
Increase through other contributions by owners, equity	4,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	4,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through treasury share transactions, equity	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2,061 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	—	—	—	3,000,000 EUR	—	2,000,000 EUR	—	—	—	—	—	—	—	—	—	—	1,000,000 EUR	2,000,000 EUR	—	5,000,000 EUR	—	—	—	—	3,000,000 EUR	—	—	2,000,000 EUR	—	—	—	—	—	—	—	5,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—