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Derivatives (Details) £ in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 GBP (£)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)
Derivative [Line Items]
Derivative loss	$ 1.3
Foreign Currency Forward
Derivative [Line Items]
Derivative liability, notional amount | £		£ 67.6
Derivative asset, notional amount | £				£ 47.3
Foreign Currency Forward | Other Current Liabilities
Derivative [Line Items]
Derivative liability	$ 2.1
Foreign Currency Forward | Receivables
Derivative [Line Items]
Derivative asset			$ 5.1

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- Definition

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

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