Statement Of Comprehensive Income [Abstract]

Halma PLC - Filing #1662759

Concept	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31
Statement of comprehensive income [abstract]
Profit (loss)	3,700,000 GBP	247,900,000 GBP	– GBP	200,000 GBP	244,200,000 GBP	– GBP	– GBP	244,400,000 GBP	– GBP	– GBP	– GBP	244,200,000 GBP	– GBP	222,500,000 GBP	19,200,000 GBP	203,300,000 GBP	– GBP	– GBP	– GBP	– GBP	203,300,000 GBP	– GBP	– GBP	203,400,000 GBP	– GBP	100,000 GBP
Other comprehensive income [abstract]
Other comprehensive income	—	—	– GBP	– GBP	—	43,900,000 GBP	– GBP	32,000,000 GBP	1,700,000 GBP	– GBP	1,100,000 GBP	73,100,000 GBP	– GBP	—	—	—	75,500,000 GBP	– GBP	– GBP	– GBP	99,400,000 GBP	– GBP	– GBP	24,700,000 GBP	800,000 GBP	– GBP
Comprehensive income	—	—	– GBP	200,000 GBP	—	43,900,000 GBP	– GBP	276,400,000 GBP	1,700,000 GBP	– GBP	1,100,000 GBP	317,300,000 GBP	– GBP	—	—	—	75,500,000 GBP	– GBP	– GBP	– GBP	103,900,000 GBP	– GBP	– GBP	178,700,000 GBP	800,000 GBP	100,000 GBP
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	—	—	—	—	317,500,000 GBP	—	—	—	—	—	—	—	—	104,000,000 GBP	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	—	—	—	—	200,000 GBP	—	—	—	—	—	—	—	—	100,000 GBP	—	—	—	—	—