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Acquisition of Shoal Creek Mine - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Feb. 22, 2019 | Dec. 31, 2018 | Dec. 03, 2018
Business Acquisition [Line Items] |  |  |  |  |
Finite Lived Intangible Liabilities | $ 79.1 |  |  | $ 90.0 |
Revenues | 1,250.6 | $ 1,462.7 |  |  |
Net income attributable to common stockholders | $ 124.2 | $ 106.6 |  |  |
Shoal Creek |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Working Capital Adjustment |  |  | $ 2.4 |  |
Finite Lived Intangible Liabilities |  |  |  |  | $ 3.5
Drummond Company, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  |  |  |  | $ 387.4

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