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Equity Method Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 29.3 |  | $ 29.3 |  | $ 45.9
Income (Loss) from Equity Method Investments | (20.7) | $ 17.2 | (7.5) | $ 64.4 |
Depreciation, depletion and amortization and asset retirement obligation expenses | 141.5 | 169.6 | 479.4 | 503.1 |
Net interest expense | 35.4 | 38.2 | 107.2 | 112.8 |
Income tax (benefit) provision | 4.2 | 13.8 | 26.0 | 31.3 |
Cash receipts from Middlemount Coal Pty |  |  | 14.7 | 81.1 |
Middlemount Mine |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (Loss) from Equity Method Investments | $ (18.8) | 17.4 | $ (5.3) | 65.1 |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |
Depreciation, depletion and amortization and asset retirement obligation expenses | $ 8.2 | 3.7 | $ 15.3 | 11.8 |
Net interest expense | 2.4 | 2.8 | 6.4 | 10.0 |
Income tax (benefit) provision | (7.5) | $ 3.9 | (1.6) | 15.4 |
Cash receipts from Middlemount Coal Pty |  |  | 14.7 | $ 81.1 |
Intercompany loans | 50.0 |  | $ 50.0 |  |
Financing Receivable, Stated Interest Rate |  |  | 15.00% |  |
Intercompany loans, carrying value | 5.4 |  | $ 5.4 |  | $ 0.0
Tax reserve | $ 20.0 |  | $ 20.0 |  |

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