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Revenue (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Retained earnings (accumulated deficit)	$ (1,491,600,000)	$ (1,491,600,000)		$ (1,510,700,000)
Revenue	470,000,000	924,500,000
Increase in accounts receivable		53,500,000	$ 30,000,000
United States [Member]
Disaggregation of Revenue [Line Items]
Revenue	279,400,000	547,600,000
Iceland [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 190,600,000	$ 376,900,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Retained earnings (accumulated deficit)				$ 0

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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-Publisher FASB
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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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