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Analysis of cash flows - Summary of Analysis of Cash Flows (Parenthetical) (Detail) | Jun. 30, 2019 GBP (£) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Dec. 31, 2018 GBP (£) | Jun. 30, 2018 GBP (£)
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Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Cash and cash equivalents acquired from acquisitions | £ 0 |  |  | £ 11,300,000 |
Cash and cash equivalents from overdraft of acquisition |  |  |  |  | £ 3,900,000
Cash and cash equivalents acquired from disposals | 3,000,000 |  |  | £ 15,100,000 | £ 200,000
Bond amount | 7,838,200,000 |  |  |  |
Proceeds from issue of Euro 250 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | € |  |  | € 250,000,000 |  |
Proceeds from issue of Euro 500 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | € |  |  | 500,000,000 |  |
Repayment of 200 million GBP bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | £ 200,000,000 |  |  |  |
Partial repayment of Usd 450 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | € |  |  | 450,000,000 |  |
Partial repayment of Usd 272 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | $ |  | $ 272,000,000 |  |  |
Partial repayment of Usd 300 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | $ |  | 300,000,000 |  |  |
Repayment of Euro 252 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | € |  |  | € 252,000,000 |  |
Partial repayment of Usd 500 million bonds [member] |  |  |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |  |  |
Bond amount | $ |  | $ 500,000,000 |  |  |

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