Statement Of Financial Position [Abstract]

Morgan Sindall Group PLC - Filing #1588159

Concept	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-01-01	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31	As at 2019-12-31
Statement of financial position [abstract]
Assets [abstract]
Property, plant and equipment	—	—	66,600,000 GBP	—	—	—	—	—	—	65,800,000 GBP	79,500,000 GBP	—	—	—	—	—	—	—	—	—	—
Investment property	—	—	800,000 GBP	—	—	—	—	—	—	2,700,000 GBP	5,100,000 GBP	—	—	—	—	—	—	—	—	—	—
Cash and cash equivalents	—	—	468,600,000 GBP	—	—	—	—	—	—	400,500,000 GBP	251,200,000 GBP	—	—	—	—	—	—	—	—	—	—
Assets	—	—	1,707,600,000 GBP	—	—	—	—	—	—	1,488,600,000 GBP	1,454,000,000 GBP	—	—	—	—	—	—	—	—	—	—
Equity and liabilities [abstract]
Equity [abstract]
Issued capital	—	—	2,300,000 GBP	—	—	—	—	—	—	2,300,000 GBP	2,300,000 GBP	—	—	—	—	—	—	—	—	—	—
Retained earnings	—	—	427,100,000 GBP	—	—	—	—	—	—	373,100,000 GBP	346,900,000 GBP	—	—	—	—	—	—	—	—	—	—
Share premium	—	—	45,800,000 GBP	—	—	—	—	—	—	45,500,000 GBP	38,500,000 GBP	—	—	—	—	—	—	—	—	—	—
Equity attributable to owners of parent	—	—	474,200,000 GBP	—	—	—	—	—	—	420,100,000 GBP	386,900,000 GBP	—	—	—	—	—	—	—	—	—	—
Equity	427,100,000 GBP	1,000,000 GBP	474,200,000 GBP	45,800,000 GBP	2,300,000 GBP	373,100,000 GBP	2,300,000 GBP	800,000 GBP	45,500,000 GBP	420,100,000 GBP	386,900,000 GBP	800,000 GBP	38,500,000 GBP	396,800,000 GBP	356,800,000 GBP	2,300,000 GBP	2,300,000 GBP	38,500,000 GBP	346,900,000 GBP	386,900,000 GBP	800,000 GBP
Liabilities [abstract]
Deferred tax liabilities	—	—	10,000,000 GBP	—	—	—	—	—	—	12,500,000 GBP	8,100,000 GBP	—	—	—	—	—	—	—	—	—	—
Liabilities	—	—	1,233,400,000 GBP	—	—	—	—	—	—	1,068,500,000 GBP	1,067,100,000 GBP	—	—	—	—	—	—	—	—	—	—