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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 438.0 | $ 481.8 | $ 1,401.2 | $ 1,406.3
Accounts receivable - net |  |  | 10.7 | (48.3)
United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 277.1 | 286.6 | 911.9 | 834.2
Iceland [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 160.9 | $ 195.2 | 489.3 | $ 572.1
Trade Accounts Receivable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Accounts receivable - net |  |  | $ 10.9 |

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