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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions | Dec. 31, 2018 GBP (£) Kč / £ $ / £ € / £ $ / £ | Dec. 31, 2017 GBP (£) € / £ $ / £ $ / £
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U.S. dollars | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 4.8 | £ 17.1
U.S. dollars | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.2519 | 1.2433
U.S. dollars | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.3419 | 1.3444
U.S. dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 7.5 | £ 12.5
U.S. dollars | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.2609 | 1.2414
U.S. dollars | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.3380 | 1.3389
Euros | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 7.2 | £ 27.5
Euros | Sales hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.0949 | 1.0949
Euros | Sales hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1702 | 1.1803
Euros | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 1.7 | £ 0.1
Exchange rates | € / £ |  | 1.1084
Euros | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1074 |
Euros | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | € / £ | 1.1221 |
Canadian dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 2.9 |
Canadian dollars | Purchase hedges | Minimum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.7039 |
Canadian dollars | Purchase hedges | Maximum |  |
Derivative [Line Items] |  |
Exchange rates | $ / £ | 1.7416 |
Australian dollars | Sales hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ |  | £ 2.8
Exchange rates | $ / £ |  | 1.7667
Australian dollars | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ |  | £ 1.7
Exchange rates | $ / £ |  | 1.7161
Czech koruna | Purchase hedges |  |
Derivative [Line Items] |  |
Contract totals/£m | £ | £ 0.1 |
Exchange rates | Kč / £ | 28.4490 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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