Statement Of Financial Position [Abstract]

Halma PLC - Filing #6342873

Concept	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2025-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31
Statement of financial position [abstract]
Assets [abstract]
Property, plant and equipment	—	283,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	236,800,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Goodwill	—	1,263,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1,211,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Intangible assets other than goodwill	—	576,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	569,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Deferred tax assets	—	4,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	4,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Cash and cash equivalents	—	312,700,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	142,400,000 GBP	—	—	168,500,000 GBP	—	—	—	—	—	—	—	—	—
Assets	—	3,258,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2,999,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Equity and liabilities [abstract]
Equity [abstract]
Issued capital	—	38,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	38,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Retained earnings	—	1,792,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1,604,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Share premium	—	23,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	23,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Treasury shares	—	46,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	58,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Other reserves	—	3,300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	3,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Equity attributable to owners of parent	—	1,899,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1,736,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Non-controlling interests	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—
Equity	3,300,000 GBP	1,899,400,000 GBP	– GBP	200,000 GBP	23,600,000 GBP	46,900,000 GBP	38,000,000 GBP	1,792,400,000 GBP	300,000 GBP	88,500,000 GBP	3,200,000 GBP	1,604,500,000 GBP	– GBP	23,600,000 GBP	38,000,000 GBP	58,000,000 GBP	200,000 GBP	1,736,500,000 GBP	1,300,000 GBP	126,300,000 GBP	1,598,900,000 GBP	23,600,000 GBP	38,000,000 GBP	600,000 GBP	200,000 GBP	46,100,000 GBP	100,000 GBP	1,415,800,000 GBP	162,300,000 GBP	4,400,000 GBP
Liabilities [abstract]
Deferred tax liabilities	—	73,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	79,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—
Liabilities	—	1,359,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1,263,400,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—