Statement Of Comprehensive Income [Abstract]

OSB Group PLC - Filing #1592509

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	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	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)	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	345 .3 GBP	345,300,000 GBP	– GBP	196 .3 GBP	– GBP	– GBP	– GBP	196,300,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP
Other comprehensive income [abstract]
Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract]
Exchange differences on translation [abstract]
Other comprehensive income, before tax, exchange differences on translation of foreign operations	—	—	—	—	—	—	—	—	—	—	0 .1 GBP	—	—	– GBP	—	—	—	—	—	—	—	—	—	—
Financial assets measured at fair value through other comprehensive income [abstract]
Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income	—	—	—	—	—	—	—	—	—	—	1 .1 GBP	—	—	1,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Other comprehensive income, before tax	– GBP	– GBP	– GBP	– GBP	100,000 GBP	– GBP	900,000 GBP	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract]
Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income	—	—	—	—	—	—	—	—	—	—	0. 5 GBP	—	—	500,000 GBP	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	—	—	—	—	—	500,000 GBP	—	—	500,000 GBP	—	—	—	—	—	—	—	—	—	—
Comprehensive income	– GBP	– GBP	– GBP	– GBP	100,000 GBP	– GBP	0 .4 GBP	– GBP	– GBP	– GBP	344. 8 GBP	345,300,000 GBP	– GBP	196. 8 GBP	– GBP	– GBP	– GBP	196 .3 GBP	500,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	—	—	—	3 4 0.1 GBP	—	—	191. 3 GBP	—	—	—	—	—	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	—	—	—	4,700,000 GBP	—	—	5,500,000 GBP	—	—	—	—	—	—	—	—	—	—