Statement Of Changes In Equity [Abstract]

Tritax Big Box REIT PLC - Filing #1592790

Concept	As at 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	As at 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2020-12-31	2020-01-01 to 2020-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	2,331,300,000 GBP	964,500,000 GBP	4,076,500,000 GBP	—	—	762,000,000 GBP	—	18,700,000 GBP	—	—	—	1,358,700,000 GBP	17,200,000 GBP	—	466,500,000 GBP	—	2,921,300,000 GBP	—	1,078,900,000 GBP	—	446,700,000 GBP	2,561,200,000 GBP	909,300,000 GBP	1,188,100,000 GBP	17,100,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	—	—	—	—	—	—	—	972,600,000 GBP	—	449,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	—	—	– GBP	– GBP	—	– GBP	—	972,600,000 GBP	972,600,000 GBP	449,400,000 GBP	—	—	449,400,000 GBP	—	– GBP	—	– GBP	—	– GBP	—	—	—	—	—
Dividends recognised as distributions to owners	—	—	—	– GBP	114,400,000 GBP	—	– GBP	—	114,400,000 GBP	– GBP	109,200,000 GBP	—	—	– GBP	—	– GBP	—	– GBP	—	109,200,000 GBP	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	—	– GBP	– GBP	—	– GBP	—	2,700,000 GBP	2,700,000 GBP	2,400,000 GBP	—	—	2,400,000 GBP	—	– GBP	—	– GBP	—	– GBP	—	—	—	—	—