Statement Of Changes In Equity [Abstract]

F-Secure Oyj - Filing #3685819

Concept	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	As at 2024-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	35,371,000 EUR	—	80,000 EUR	1,977,000 EUR	—	—	—	9,590,000 EUR	47,018,000 EUR	—	33,086,000 EUR	25,485,000 EUR	—	—	—	80,000 EUR	2,070,000 EUR	9,590,000 EUR	—	24,804,000 EUR	15,213,000 EUR	80,000 EUR	9,590,000 EUR	79,000 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	- EUR	—	- EUR	—	—	21,067,000 EUR	21,067,000 EUR	- EUR	—	—	22,360,000 EUR	—	—	22,360,000 EUR	- EUR	- EUR	—	—	—	- EUR	—	—	—	—	—
Comprehensive income	- EUR	—	4,047,000 EUR	—	—	21,067,000 EUR	25,114,000 EUR	- EUR	—	—	20,370,000 EUR	—	—	22,360,000 EUR	1,990,000 EUR	- EUR	—	—	—	- EUR	—	—	—	—	—
Dividends recognised as distributions to owners	- EUR	—	- EUR	—	—	12,227,000 EUR	12,227,000 EUR	- EUR	—	—	12,227,000 EUR	—	—	12,227,000 EUR	- EUR	- EUR	—	—	—	- EUR	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	- EUR	—	- EUR	—	—	1,045,000 EUR	1,045,000 EUR	- EUR	—	—	139,000 EUR	—	—	139,000 EUR	- EUR	- EUR	—	—	—	- EUR	—	—	—	—	—