Analysis Of Income And Expense [Abstract]

FORTERRA PLC - Filing #2019098

Concept	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	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
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	—	346,400,000 GBP	—	—	—	—	—	—	—	—	455,500,000 GBP	—	—
Material income and expense [abstract]
Miscellaneous other operating income	—	—	500,000 GBP	—	—	—	—	—	—	—	—	3,700,000 GBP	—	—
Expenses by nature [abstract]
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Depreciation and amortisation expense	—	—	20,000,000 GBP	—	—	—	—	—	—	—	—	16,500,000 GBP	—	—
Disclosure of attribution of expenses by nature to their function [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [abstract]
Disclosure of attribution of expenses by nature to their function [line items]
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	– GBP	– GBP	12,100,000 GBP	– GBP	700,000 GBP	12,800,000 GBP	– GBP	– GBP	800,000 GBP	– GBP	– GBP	59,600,000 GBP	– GBP	58,800,000 GBP
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	12,100,000 GBP	—	—	—	—	—	—	—	—	59,600,000 GBP	—	—