Statement Of Changes In Equity [Abstract]

Halma PLC - Filing #1662765

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	As at 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	2021-04-01 to 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	2021-04-01 to 2022-03-31	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-04-01	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	As at 2021-03-31	2020-04-01 to 2021-03-31	As at 2021-03-31	2020-04-01 to 2021-03-31	As at 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	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01	As at 2020-04-01
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	—	—	—	—	—	—	—	200,000 GBP	—	—	—	30,700,000 GBP	400,000 GBP	38,000,000 GBP	117,100,000 GBP	23,600,000 GBP	1,274,800,000 GBP	—	1,403,100,000 GBP	400,000 GBP	19,900,000 GBP	—	1,065,800,000 GBP	23,600,000 GBP	600,000 GBP	38,000,000 GBP	1,167,600,000 GBP	20,900,000 GBP	700,000 GBP	73,200,000 GBP	13,600,000 GBP	200,000 GBP	200,000 GBP	20,900,000 GBP	13,600,000 GBP	1,167,600,000 GBP	38,000,000 GBP	23,600,000 GBP	700,000 GBP	600,000 GBP	—	1,065,800,000 GBP	—	73,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—	200,000 GBP	23,600,000 GBP	38,000,000 GBP	148,700,000 GBP	7,700,000 GBP	700,000 GBP	14,300,000 GBP	949,200,000 GBP	1,136,900,000 GBP	100,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	3,700,000 GBP	247,900,000 GBP	– GBP	– GBP	200,000 GBP	– GBP	244,200,000 GBP	244,400,000 GBP	—	– GBP	– GBP	– GBP	—	—	—	—	—	—	244,200,000 GBP	—	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	222,500,000 GBP	—	203,300,000 GBP	—	19,200,000 GBP	– GBP	– GBP	– GBP	– GBP	203,300,000 GBP	– GBP	– GBP	203,400,000 GBP	– GBP	100,000 GBP	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	—	– GBP	– GBP	– GBP	43,900,000 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	– GBP	200,000 GBP	43,900,000 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	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	—	– GBP	– GBP	– GBP	– GBP	—	68,700,000 GBP	—	– GBP	– GBP	– GBP	—	—	—	—	—	—	68,700,000 GBP	—	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	– GBP	– GBP	– GBP	– GBP	63,700,000 GBP	– GBP	– GBP	63,700,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	—	– GBP	– GBP	– GBP	– GBP	—	– GBP	—	12,200,000 GBP	– GBP	– GBP	—	—	—	—	—	—	12,200,000 GBP	—	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	– GBP	11,900,000 GBP	– GBP	– GBP	11,900,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	—