Statement Of Changes In Equity [Abstract]

Spirax-Sarco Engineering PLC - Filing #1871845

Concept	As at 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	As at 2022-01-01	As at 2022-01-01	As at 2022-01-01	As at 2022-01-01	As at 2022-01-01	As at 2022-01-01	As at 2022-01-01	As at 2022-01-01	2021-01-01 to 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	2021-01-01 to 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	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 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	1,169,800,000 GBP	—	—	—	—	—	23,400,000 GBP	800,000 GBP	88,100,000 GBP	1,067,000,000 GBP	19,800,000 GBP	17,500,000 GBP	1,169,000,000 GBP	—	—	—	—	—	40,500,000 GBP	1,009,000,000 GBP	961,100,000 GBP	86,300,000 GBP	19,800,000 GBP	1,000,000 GBP	1,010,000,000 GBP	17,700,000 GBP	—	961,100,000 GBP	17,700,000 GBP	—	—	1,010,000,000 GBP	—	—	—	—	1,009,000,000 GBP	—	40,500,000 GBP	19,800,000 GBP	1,000,000 GBP	86,300,000 GBP	—	—	33,700,000 GBP	19,800,000 GBP	852,300,000 GBP	782,800,000 GBP	2,400,000 GBP	84,800,000 GBP	851,300,000 GBP	1,000,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	– GBP	– GBP	225,000,000 GBP	224,700,000 GBP	300,000 GBP	—	—	—	—	—	—	—	53,100,000 GBP	278,100,000 GBP	224,700,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	300,000 GBP	—	—	– GBP	234,600,000 GBP	—	– GBP	– GBP	15,100,000 GBP	250,000,000 GBP	—	– GBP	—	—	—	—	234,900,000 GBP	234,600,000 GBP	—	—	—	—	—	—	—	—
Other comprehensive income	—	– GBP	3,500,000 GBP	48,000,000 GBP	6,500,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	48,000,000 GBP	– GBP	58,000,000 GBP	—	—	—	—	—	—	—	—	– GBP	—	—	2,800,000 GBP	27,800,000 GBP	—	– GBP	6,800,000 GBP	—	—	—	– GBP	—	—	—	—	27,800,000 GBP	37,400,000 GBP	—	—	—	—	—	—	—	—
Comprehensive income	—	– GBP	3,500,000 GBP	273,000,000 GBP	218,200,000 GBP	300,000 GBP	—	—	—	—	—	—	—	—	—	272,700,000 GBP	– GBP	58,000,000 GBP	—	—	—	—	—	—	—	—	300,000 GBP	—	—	2,800,000 GBP	262,400,000 GBP	—	– GBP	6,800,000 GBP	—	—	—	– GBP	—	—	—	—	262,700,000 GBP	272,000,000 GBP	—	—	—	—	—	—	—	—
Issue of equity	—	– GBP	– GBP	1,800,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	—	1,800,000 GBP	1,800,000 GBP	– GBP	—	—	—	—	—	—	—	—	– GBP	—	—	– GBP	1,500,000 GBP	—	1,500,000 GBP	– GBP	—	—	—	– GBP	—	—	—	—	1,500,000 GBP	– GBP	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	– GBP	– GBP	103,600,000 GBP	103,100,000 GBP	500,000 GBP	—	—	—	—	—	—	—	—	—	103,100,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	300,000 GBP	—	—	– GBP	90,700,000 GBP	—	– GBP	– GBP	—	—	—	– GBP	—	—	—	—	91,000,000 GBP	90,700,000 GBP	—	—	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	– GBP	– GBP	9,200,000 GBP	9,200,000 GBP	– GBP	—	—	—	—	—	—	—	—	—	9,200,000 GBP	– GBP	– GBP	—	—	—	—	—	—	—	—	– GBP	—	—	– GBP	3,000,000 GBP	—	– GBP	– GBP	—	—	—	– GBP	—	—	—	—	3,000,000 GBP	3,000,000 GBP	—	—	—	—	—	—	—	—