Statement Of Comprehensive Income [Abstract]

Spirax-Sarco Engineering PLC - Filing #1871845

Concept	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	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	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
Statement of 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 [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract]
Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans	– GBP	– GBP	8,300,000 GBP	8,300,000 GBP	– GBP	—	—	8,300,000 GBP	– GBP	– GBP	– GBP	– GBP	46,300,000 GBP	– GBP	– GBP	—	—	– GBP	46,300,000 GBP	46,300,000 GBP
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract]
Income tax relating to remeasurements of defined benefit plans included in other comprehensive income	– GBP	– GBP	1,800,000 GBP	1,800,000 GBP	– GBP	—	—	1,800,000 GBP	– GBP	– GBP	– GBP	– GBP	8,900,000 GBP	– GBP	– GBP	—	—	– GBP	8,900,000 GBP	8,900,000 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
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	272,700,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	262,400,000 GBP	—
Comprehensive income, attributable to non-controlling interests	—	—	300,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	300,000 GBP	—