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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 421.2 | $ 490.0
Decrease in accounts receivable - net | (17.2) | 8.4
United States [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 274.1 | 325.2
Iceland [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 147.1 | $ 164.8
Trade Accounts Receivable [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Decrease in accounts receivable - net | $ (17.3) |

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