Analysis Of Income And Expense [Abstract]

FORTERRA PLC - Filing #1590385

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	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
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	—	—	—	370,400,000 GBP	—	—	—	29 1.9 GBP	—	—	—
Material income and expense [abstract]
Miscellaneous other operating income	—	—	—	—	9,000,000 GBP	—	—	—	200,000 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	—	—	—	—	1 6.4 GBP	—	—	—	1 7 .1 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	200,000 GBP	– GBP	– GBP	– GBP	45,300,000 GBP	45,500,000 GBP	5,600,000 GBP	– GBP	5,600,000 GBP	– GBP	– GBP	– GBP
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	45,300,000 GBP	—	—	—	5,600,000 GBP	—	—	—