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Derivatives (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) instrument	Dec. 31, 2020 GBP (£)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Number of foreign currency forward transactions | instrument	2
Derivative loss	$ 29.0
Foreign Currency Forward
Derivative [Line Items]
Notional amount | £		£ 47.3		£ 53.0
Foreign Currency Forward | Accounts Receivable
Derivative [Line Items]
Derivative asset			$ 5.1		$ 3.1

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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No definition available.

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- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
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The number of derivative instruments of a particular group held by the entity.

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