Statement Of Changes In Equity [Abstract]

F-Secure Oyj - Filing #3685827

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 EUR	—	80,000 EUR	1 977 EUR	—	—	—	9 590 EUR	47 018 EUR	—	33 086 EUR	25 485 EUR	—	—	—	80,000 EUR	2 070 EUR	9 590 EUR	—	24 804 EUR	15 213 EUR	80,000 EUR	9 590 EUR	79,000 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	- EUR	—	- EUR	—	—	21 067 EUR	21 067 EUR	- EUR	—	—	22 360 EUR	—	—	22 360 EUR	- EUR	- EUR	—	—	—	- EUR	—	—	—	—	—
Comprehensive income	- EUR	—	4 047 EUR	—	—	21 067 EUR	25 114 EUR	- EUR	—	—	20 370 EUR	—	—	22 360 EUR	1 990 EUR	- EUR	—	—	—	- EUR	—	—	—	—	—
Dividends recognised as distributions to owners	- EUR	—	- EUR	—	—	12 227 EUR	12 227 EUR	- EUR	—	—	12 227 EUR	—	—	12 227 EUR	- EUR	- EUR	—	—	—	- EUR	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	- EUR	—	- EUR	—	—	1 045 EUR	1 045 EUR	- EUR	—	—	139,000 EUR	—	—	139,000 EUR	- EUR	- EUR	—	—	—	- EUR	—	—	—	—	—