Statement Of Changes In Equity [Abstract]

OSB Group PLC - Filing #1592512

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	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	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	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	As at 2021-12-31	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 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	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	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	2020-01-01 to 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 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	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	3 .5 GBP	– GBP	3,215. 1 GBP	150,000,000 GBP	1 ,355 .3 GBP	—	2,024,400,000 GBP	—	600,000 GBP	—	—	—	—	700,000 GBP	—	1 .1 GBP	4,500,000 GBP	—	—	1 3.4 GBP	– GBP	—	—	1,355,300,000 GBP	—	—	—	1,608,600,000 GBP	60,000,000 GBP	—	—	1,359 .8 GBP	—	—	—	4,000,000 GBP	1,000,000 GBP	– GBP	7. 8 GBP	—	1,6 7 6. 9 GBP	—	—	– GBP	1,000,000 GBP	—	– GBP	12,800,000 GBP	– GBP	1,000,000 GBP	6,500,000 GBP	8 64.2 GBP	1 , 4 7 7. 0 GBP	553. 2 GBP	500,000 GBP	5,600,000 GBP	3,700,000 GBP	4,500,000 GBP	60,000,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	– GBP	—	—	—	—	—	– GBP	—	– GBP	—	– GBP	– GBP	– GBP	– GBP	—	– GBP	—	—	– GBP	– GBP	—	—	345 .3 GBP	345,300,000 GBP	—	196 .3 GBP	– GBP	– GBP	—	—	– GBP	– GBP	—	196,300,000 GBP	– GBP	– GBP	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	– 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	—	196. 8 GBP	– GBP	– GBP	—	—	– GBP	– GBP	—	196 .3 GBP	500,000 GBP	– GBP	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Issue of equity	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	4. 5 GBP	1 ,355.3 GBP	– GBP	—	—	– GBP	– GBP	—	– GBP	– GBP	– GBP	—	—	—	—	1,359 .8 GBP	—	– GBP	– GBP	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	—	—	—	—	– GBP	—	– GBP	—	– GBP	– GBP	– GBP	– GBP	—	– GBP	—	—	– GBP	– GBP	—	—	86,700,000 GBP	86,700,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through treasury share transactions, equity	– GBP	—	—	—	—	—	500,000 GBP	—	– GBP	—	– GBP	– GBP	– GBP	– GBP	—	– GBP	—	—	– GBP	– GBP	—	—	– GBP	500,000 GBP	—	0 .1 GBP	– GBP	– GBP	—	—	– GBP	0 .3 GBP	—	0 .4 GBP	– GBP	– GBP	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	60 .0 GBP	—	—	—	—	—	– GBP	—	– GBP	—	– GBP	– GBP	– GBP	– GBP	—	– GBP	—	—	– GBP	– GBP	—	—	60. 0 GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	—	—	—	—	—	– GBP	—	700,000 GBP	—	4,000,000 GBP	– GBP	– GBP	– GBP	—	– GBP	—	—	– GBP	– GBP	—	—	7. 6 GBP	2 .9 GBP	—	8. 2 GBP	– GBP	– GBP	—	—	– GBP	– GBP	—	3,200,000 GBP	– GBP	2 .4 GBP	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	2,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—