Statement Of Changes In Equity [Abstract]

FORTERRA PLC - Filing #2019096

Concept	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 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	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	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	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	—	207,800,000 GBP	—	—	219,800,000 GBP	200,000 GBP	– GBP	—	—	2,100,000 GBP	14,200,000 GBP	100,000 GBP	—	220,500,000 GBP	—	—	—	—	—	—	—	– GBP	200,000 GBP	233,400,000 GBP	15,800,000 GBP	2,100,000 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
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	– GBP	12,800,000 GBP	—	– GBP	– GBP	—	—	—	12,800,000 GBP	– GBP	—	—	—	– GBP	—	– GBP	– GBP	– GBP	58,800,000 GBP	58,800,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	– GBP	700,000 GBP	—	– GBP	– GBP	—	—	—	– GBP	– GBP	—	—	—	700,000 GBP	—	– GBP	– GBP	– GBP	800,000 GBP	– GBP	800,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	– GBP	12,100,000 GBP	—	– GBP	– GBP	—	—	—	12,800,000 GBP	– GBP	—	—	—	700,000 GBP	—	– GBP	– GBP	– GBP	59,600,000 GBP	58,800,000 GBP	800,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	25,700,000 GBP	—	– GBP	– GBP	—	—	—	25,700,000 GBP	– GBP	—	—	—	– GBP	—	– GBP	– GBP	– GBP	24,200,000 GBP	24,200,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	– GBP	1,700,000 GBP	—	– GBP	– GBP	—	—	—	1,700,000 GBP	– GBP	—	—	—	– GBP	—	– GBP	– GBP	– GBP	3,400,000 GBP	3,400,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—