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Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Footnote) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 838.5
SPAIN
Operating Loss Carryforwards [Line Items]
Tax losses and disallowed finance costs	9.2
Norway
Operating Loss Carryforwards [Line Items]
Tax losses and disallowed finance costs	$ 15.4
Carryforward term (in years)	10
LUXEMBOURG
Operating Loss Carryforwards [Line Items]
Carryforward term (in years)	17

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Publisher FASB
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-Topic 740
-SubTopic 10
-Section 50
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