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Condensed consolidating financial information for bonds issued by WPP Finance 2010 with WPP plc as parent guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as subsidiary guarantors - Condensed Consolidating Cash Flow Statement Information (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of condensed consolidating cash flow statement information [line items]      
Net cash inflow/(outflow) from operating activities £ 72.9 £ 85.6 £ 1,408.1
Investing activities      
Acquisitions and disposals 374.0 (201.4) (181.5)
Purchases of property, plant and equipment (158.0) (100.0) (288.9)
Purchases of other intangible assets (including capitalised computer software) (20.3) (19.6) (37.3)
Proceeds on disposal of property, plant and equipment 14.7 4.0 8.0
Net cash inflow/(outflow) from investing activities 210.4 (317.0) (499.7)
Financing activities      
Share option proceeds 0.7 4.1 6.4
Cash consideration for non-controlling interests (79.8) (39.3) (47.3)
Share repurchases and buy-backs (200.8) (290.2) (504.2)
Net increase/(decrease) in borrowings 67.0 894.8 599.6
Financing and share issue costs (3.1) (0.6) (0.8)
Equity dividends paid     (751.5)
Dividends paid to non-controlling interests in subsidiary undertakings (65.8) (46.3) (87.8)
Net cash (outflow)/inflow from financing activities (281.8) 522.5 (785.6)
Net increase/(decrease) in cash and cash equivalents 1.5 291.1 122.8
Translation of cash and cash equivalents (78.1) 17.8 (27.2)
Cash and cash equivalents at beginning of period 1,998.2 1,902.6 1,902.6
Cash and cash equivalents at end of period 1,921.6 2,211.5 1,998.2
Condensed Consolidating Financial Information for Bonds Issued by WPP Finance 2010 with WPP plc as Parent Guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as Subsidiary Guarantors [member]      
Disclosure of condensed consolidating cash flow statement information [line items]      
Net cash inflow/(outflow) from operating activities 72.9 85.6 1,408.1
Investing activities      
Acquisitions and disposals 374.0 (201.4) (181.5)
Purchases of property, plant and equipment (158.0) (100.0) (288.9)
Purchases of other intangible assets (including capitalised computer software) (20.3) (19.6) (37.3)
Proceeds on disposal of property, plant and equipment 14.7 4.0 8.0
Net cash inflow/(outflow) from investing activities 210.4 (317.0) (499.7)
Financing activities      
Share option proceeds 0.7 4.1 6.4
Cash consideration for non-controlling interests (79.8) (39.3) (47.3)
Share repurchases and buy-backs (200.8) (290.2) (504.2)
Net increase/(decrease) in borrowings 67.0 894.8 599.6
Financing and share issue costs (3.1) (0.6) (0.8)
Equity dividends paid     (751.5)
Dividends paid to non-controlling interests in subsidiary undertakings (65.8) (46.3) (87.8)
Net cash (outflow)/inflow from financing activities (281.8) 522.5 (785.6)
Net increase/(decrease) in cash and cash equivalents 1.5 291.1 122.8
Translation of cash and cash equivalents (78.1) 17.8 (27.2)
Cash and cash equivalents at beginning of period 1,998.2 1,902.6 1,902.6
Cash and cash equivalents at end of period 1,921.6 2,211.5 1,998.2
WPP plc [member] | Condensed Consolidating Financial Information for Bonds Issued by WPP Finance 2010 with WPP plc as Parent Guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as Subsidiary Guarantors [member]      
Disclosure of condensed consolidating cash flow statement information [line items]      
Net cash inflow/(outflow) from operating activities 417.4 191.5 32.9
Financing activities      
Share option proceeds 0.7 4.1 6.4
Share repurchases and buy-backs (104.3) (144.9) (289.6)
Net increase/(decrease) in borrowings   (400.0) (400.0)
Equity dividends paid     (751.5)
Net cash (outflow)/inflow from financing activities (103.6) (540.8) (1,434.7)
Net increase/(decrease) in cash and cash equivalents 313.8 (349.3) (1,401.8)
Translation of cash and cash equivalents (0.5) (1.3) (0.9)
Cash and cash equivalents at beginning of period (2,627.7) (1,225.0) (1,225.0)
Cash and cash equivalents at end of period (2,314.4) (1,575.6) (2,627.7)
Subsidiary Guarantors [member] | Condensed Consolidating Financial Information for Bonds Issued by WPP Finance 2010 with WPP plc as Parent Guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as Subsidiary Guarantors [member]      
Disclosure of condensed consolidating cash flow statement information [line items]      
Net cash inflow/(outflow) from operating activities 171.2 (184.2) (49.7)
Investing activities      
Purchases of property, plant and equipment (3.5) (5.4) (10.4)
Net cash inflow/(outflow) from investing activities (3.5) (5.4) (10.4)
Financing activities      
Cash consideration for non-controlling interests (0.3) (0.2) (1.4)
Net cash (outflow)/inflow from financing activities (0.3) (0.2) (1.4)
Net increase/(decrease) in cash and cash equivalents 167.4 (189.8) (61.5)
Translation of cash and cash equivalents (21.9) 26.4 48.4
Cash and cash equivalents at beginning of period (1,636.8) (1,623.7) (1,623.7)
Cash and cash equivalents at end of period (1,491.3) (1,787.1) (1,636.8)
WPP Finance 2010 [member] | Condensed Consolidating Financial Information for Bonds Issued by WPP Finance 2010 with WPP plc as Parent Guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as Subsidiary Guarantors [member]      
Disclosure of condensed consolidating cash flow statement information [line items]      
Net cash inflow/(outflow) from operating activities 54.1 0.4 (13.6)
Financing activities      
Net increase/(decrease) in borrowings (20.8)    
Net cash (outflow)/inflow from financing activities (20.8)    
Net increase/(decrease) in cash and cash equivalents 33.3 0.4 (13.6)
Translation of cash and cash equivalents (1.3) 0.7 1.3
Cash and cash equivalents at beginning of period (27.4) (15.1) (15.1)
Cash and cash equivalents at end of period 4.6 (14.0) (27.4)
Other Subsidiaries [member] | Condensed Consolidating Financial Information for Bonds Issued by WPP Finance 2010 with WPP plc as Parent Guarantor and WPP Air 1, WPP 2008 Limited, WPP 2005 Limited, WPP 2012 Limited, and WPP Jubilee Limited as Subsidiary Guarantors [member]      
Disclosure of condensed consolidating cash flow statement information [line items]      
Net cash inflow/(outflow) from operating activities (569.8) 77.9 1,438.5
Investing activities      
Acquisitions and disposals 374.0 (201.4) (181.5)
Purchases of property, plant and equipment (154.5) (94.6) (278.5)
Purchases of other intangible assets (including capitalised computer software) (20.3) (19.6) (37.3)
Proceeds on disposal of property, plant and equipment 14.7 4.0 8.0
Net cash inflow/(outflow) from investing activities 213.9 (311.6) (489.3)
Financing activities      
Cash consideration for non-controlling interests (79.5) (39.1) (45.9)
Share repurchases and buy-backs (96.5) (145.3) (214.6)
Net increase/(decrease) in borrowings 87.8 1,294.8 999.6
Financing and share issue costs (3.1) (0.6) (0.8)
Dividends paid to non-controlling interests in subsidiary undertakings (65.8) (46.3) (87.8)
Net cash (outflow)/inflow from financing activities (157.1) 1,063.5 650.5
Net increase/(decrease) in cash and cash equivalents (513.0) 829.8 1,599.7
Translation of cash and cash equivalents (54.4) (8.0) (76.0)
Cash and cash equivalents at beginning of period 6,290.1 4,766.4 4,766.4
Cash and cash equivalents at end of period £ 5,722.7 £ 5,588.2 £ 6,290.1