Analysis Of Income And Expense [Abstract]

Tritax Big Box REIT PLC - Filing #1592790

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	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]
Material income and expense [abstract]
Gains (losses) on disposals of investment properties [abstract]
Gains (losses) on disposals of investment properties	—	—	—	2,000,000 GBP	—	—	—	100,000 GBP	—	—
Other operating income (expense)	—	—	—	18,900,000 GBP	—	—	—	8,600,000 GBP	—	—
Rental income	—	—	—	184,700,000 GBP	—	—	—	161,600,000 GBP	—	—
Property service charge income (expense) [abstract]
Property service charge income	—	—	—	5,100,000 GBP	—	—	—	4,600,000 GBP	—	—
Property service charge expense	—	—	—	5,200,000 GBP	—	—	—	4,700,000 GBP	—	—
Gains (losses) on change in fair value of derivatives [abstract]
Gains (losses) on change in fair value of derivatives	—	—	—	2,800,000 GBP	—	—	—	2,300,000 GBP	—	—
Expenses by nature [abstract]
Classes of employee benefits expense [abstract]
Expense from share-based payment transactions with employees	—	—	—	5,500,000 GBP	—	—	—	5,900,000 GBP	—	—
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Impairment loss (reversal of impairment loss) recognised in profit or loss	—	—	—	2,900,000 GBP	—	—	—	400,000 GBP	—	—
Other expenses, by nature	—	—	—	5,800,000 GBP	—	—	—	19,700,000 GBP	—	—
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of joint ventures accounted for using equity method	—	—	—	100,000 GBP	—	—	—	100,000 GBP	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	– GBP	– GBP	– GBP	972,600,000 GBP	972,600,000 GBP	449,400,000 GBP	– GBP	449,400,000 GBP	– GBP	– GBP