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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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