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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument £ in Millions	Dec. 31, 2019 GBP (£) $ / £ € / £ $ / £	Dec. 31, 2018 GBP (£) Kč / £ € / £ $ / £ $ / £
U.S. dollars | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.1	£ 4.8
Exchange rates | $ / £	1.2914
U.S. dollars | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £		1.2519
U.S. dollars | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £		1.3419
U.S. dollars | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 1.3	£ 7.5
Exchange rates | $ / £	1.3228
U.S. dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates | $ / £		1.2609
U.S. dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates | $ / £		1.3380
Euros | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 7.6	£ 7.2
Euros | Sales hedges | Minimum
Derivative [Line Items]
Exchange rates | € / £	1.1551	1.0949
Euros | Sales hedges | Maximum
Derivative [Line Items]
Exchange rates | € / £	1.1750	1.1702
Euros | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.8	£ 1.7
Exchange rates | € / £	1.1663
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 | £	£ 7.0	£ 2.9
Canadian dollars | Purchase hedges | Minimum
Derivative [Line Items]
Exchange rates	1.7137	1.7039
Canadian dollars | Purchase hedges | Maximum
Derivative [Line Items]
Exchange rates	1.7664	1.7416
Czech koruna | Purchase hedges
Derivative [Line Items]
Contract totals/£m | £		£ 0.1
Exchange rates | Kč / £		28.449
Japan, Yen | Sales hedges
Derivative [Line Items]
Contract totals/£m | £	£ 0.1
Exchange rates | $ / £	142.86

X

- Definition

Derivative, Notional Amount1

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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X

- 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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X

- Details

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X

- Details

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X

- Details

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Balance Type:
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X

- Details

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- Details

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- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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