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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Carryforwards
Valuation allowance against deferred tax assets	$ 64.2	$ 45.7
UK
Carryforwards
Valuation allowance against deferred tax assets	14.9
UK | Capital loss carryforwards
Carryforwards
Tax credit carryforwards	2.7
Germany
Carryforwards
Net operating loss carryforwards	54.4
Valuation allowance against net operating loss carryforwards	18.0
New Zealand
Carryforwards
Net operating loss carryforwards	4.6
Italy
Carryforwards
Net operating loss carryforwards	0.1
Federal and state | U.S.
Carryforwards
Net operating loss carryforwards	484.5
Tax credit carryforwards	4.9
Net operating loss carryforwards utilized	157.4
Valuation allowance against net operating loss carryforwards	0.8
Valuation allowance against tax credit carryforwards	0.4
Foreign | U.S.
Carryforwards
Tax credit carryforwards	53.2
Valuation allowance against tax credit carryforwards	$ 30.2

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

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