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Acquisitions - Bluewater - Purchase Price Allocation (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 0.0 | $ 7.3
Bluewater |  |  |
Business Acquisition [Line Items] |  |  |
Current assets | $ 2.0 |  |
Net property, plant, and equipment | 217.6 |  |
Goodwill | 7.3 |  |
Current liabilities | (0.9) |  |
Total purchase price | 226.0 |  |
Business Acquisition, Transaction Costs | $ 4.9 |  |

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