Statement Of Changes In Equity [Abstract]

FORTERRA PLC - Filing #1870672

Concept	As at 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	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	As at 2022-12-31	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	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	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	2 20 . 5 GBP	—	—	—	—	—	—	—	– GBP	0. 2 GBP	2 3 3. 4 GBP	15 . 8 GBP	2 .1 GBP	600,000 GBP	4,600,000 GBP	213,400,000 GBP	– GBP	—	23,900,000 GBP	—	—	234,800,000 GBP	200,000 GBP	—	—	2,300,000 GBP	—	—	162,300,000 GBP	– GBP	2,300,000 GBP	2,000,000 GBP	41,500,000 GBP	204,100,000 GBP	– GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	– GBP	– GBP	– GBP	5 8. 8 GBP	5 8 .8 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	– GBP	– GBP	—	45,500,000 GBP	45,500,000 GBP	—	—	—	—	—	—	—
Other comprehensive income	—	– GBP	– GBP	– GBP	0 . 8 GBP	– GBP	0 .8 GBP	– GBP	—	—	—	—	—	—	—	—	—	200,000 GBP	—	– GBP	– GBP	—	—	– GBP	– GBP	—	200,000 GBP	– GBP	—	—	—	—	—	—	—
Comprehensive income	—	– GBP	– GBP	– GBP	5 9. 6 GBP	5 8 . 8 GBP	0 . 8 GBP	– GBP	—	—	—	—	—	—	—	—	—	200,000 GBP	—	– GBP	– GBP	—	—	– GBP	– GBP	—	45,300,000 GBP	45,500,000 GBP	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	– GBP	– GBP	– GBP	24,200,000 GBP	24,200,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	– GBP	– GBP	—	13,700,000 GBP	13,700,000 GBP	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	– GBP	– GBP	– GBP	3. 4 GBP	3. 4 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	– GBP	—	– GBP	– GBP	—	—	– GBP	– GBP	—	2,500,000 GBP	2,500,000 GBP	—	—	—	—	—	—	—