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Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 401.9	$ 473.1	$ 823.1	$ 963.2
Decrease in accounts receivable			(34.1)	(0.7)
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	247.9	309.5	522.0	634.8
Iceland [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 154.0	$ 163.6	301.1	$ 328.4
Trade Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Decrease in accounts receivable			$ 34.2

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