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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net Sales	$ 1,605.1	$ 1,836.6	$ 1,893.2
United States [Member]
Disaggregation of Revenue [Line Items]
Net Sales	1,007.5	1,179.6	1,138.6
Iceland [Member]
Disaggregation of Revenue [Line Items]
Net Sales	$ 597.6	$ 657.0	$ 754.6

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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