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Revenue (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Retained earnings (accumulated deficit) | $ (1,511,900,000) | $ (1,511,900,000) |  | $ (1,510,700,000)
Revenue | 481,800,000 | 1,406,300,000 |  |
Increase in accounts receivable |  | 48,300,000 | $ 27,900,000 |
United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 286,600,000 | 834,200,000 |  |
Iceland [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 195,200,000 | $ 572,100,000 |  |
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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