Analysis Of Income And Expense [Abstract]

TP ICAP Group PLC - Filing #1596611

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	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	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	—	—	—	—	—	—	—	—	—	—	1,8 6 5 GBP	—	1 , 794 GBP	—	—	—	—	—	—	—	—	—	—
Material income and expense [abstract]
Selling, general and administrative expense [abstract]
General and administrative expense	—	—	—	—	—	—	—	—	—	—	4 76 GBP	—	360,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Operating expense	—	—	—	—	—	—	—	—	—	—	1,7 7 8 GBP	—	1 , 632 GBP	—	—	—	—	—	—	—	—	—	—
Expenses by nature [abstract]
Classes of employee benefits expense [abstract]
Employee benefits expense	—	—	—	—	—	—	—	—	—	—	1 , 152 GBP	—	1, 153 GBP	—	—	—	—	—	—	—	—	—	—
Miscellaneous other comprehensive income [abstract]
Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract]
Other comprehensive income, before tax, exchange differences on translation of foreign operations	—	—	—	—	—	—	—	—	—	—	1,000,000 GBP	—	30,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Other comprehensive income, before tax, hedges of net investments in foreign operations	—	—	—	—	—	—	—	—	—	—	3,000,000 GBP	—	2,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates and joint ventures accounted for using equity method	—	—	—	—	—	—	—	—	—	—	7,000,000 GBP	—	16,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Income tax relating to components of other comprehensive income [abstract]
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss	—	—	—	—	—	—	—	—	—	—	– GBP	—	– GBP	—	—	—	—	—	—	—	—	—	—
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	—	—	—	—	—	—	—	—	—	—	1,000,000 GBP	—	1,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	3,000,000 GBP	– GBP	– GBP	– GBP	3,000,000 GBP	– GBP	1,000,000 GBP	12,000,000 GBP	– GBP	– GBP	15,000,000 GBP	8,000,000 GBP	70,000,000 GBP	– GBP	– GBP	98,000,000 GBP	– GBP	29,000,000 GBP	– GBP	– GBP	1,000,000 GBP	– GBP	69,000,000 GBP
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	—	—	—	12,000,000 GBP	—	69,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	—	—	—	3,000,000 GBP	—	1,000,000 GBP	—	—	—	—	—	—	—	—	—	—