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Summary of Significant Accounting Policies, Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Income tax
Undistributed foreign earnings	$ 900.0
Income tax expense (benefit)		$ (14.5)
GILTI policy	Tax as incurred

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Indicates method of accounting for tax on global intangible low-taxed income (GILTI). Acceptable values are "Tax as incurred" and "Deferred tax recognized".

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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