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Acquisition of Shoal Creek Mine - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 31, 2019 | Dec. 03, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization | $ 141.5 |  |  |  | $ 169.6 | $ 479.4 | $ 503.1 |  |
Finite Lived Intangible Liabilities | 64.6 |  |  | $ 90.0 |  | 64.6 |  |  |
Revenues | 1,106.4 |  |  |  | 1,412.6 | 3,506.0 | 4,184.7 |  |
Net (loss) income attributable to common stockholders | (82.8) |  |  |  | $ 71.5 | 78.5 | 291.8 |  |
Shoal Creek |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  | $ 0.4 | $ 0.5 | $ 0.4 |  |  |  |  |
Working Capital Adjustment |  |  |  |  |  |  |  | $ 2.4 |
Total purchase price | $ 389.8 |  |  |  |  | $ 389.8 |  |  | $ 389.8
Finite Lived Intangible Liabilities |  |  |  |  |  |  |  |  | 3.5
Business Acquisition, Pro Forma Taxable Income Impact |  |  |  |  |  |  | $ 0.0 |  |
Drummond Company, Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | $ 387.4

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