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Acquisition of Shoal Creek Mine - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 31, 2019 | Dec. 03, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Depreciation, depletion and amortization | $ 165.4 |  |  | $ 163.9 | $ 337.9 | $ 333.5 |  |
Finite Lived Intangible Liabilities | 71.1 |  | $ 90.0 |  | 71.1 |  |  |
Revenues | 1,149.0 |  |  | 1,309.4 | 2,399.6 | 2,772.1 |  |
Net income attributable to common stockholders | $ 37.1 |  |  | $ 113.7 | $ 161.3 | 220.3 |  |
Shoal Creek |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  | $ 1.1 | $ 0.2 |  |  |  |  |
Working Capital Adjustment |  |  |  |  |  |  | $ 2.4 |
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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