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Equity Method Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 44.0 |  | $ 44.0 |  | $ 45.9
Income (Loss) from Equity Method Investments | 9.7 | $ 25.2 | 13.2 | $ 47.2 |
Depreciation, depletion and amortization and asset retirement obligation expenses | 165.4 | 163.9 | 337.9 | 333.5 |
Net interest expense | 36.0 | 38.3 | 71.8 | 74.6 |
Income tax provision | 3.0 | 7.4 | 21.8 | 17.5 |
Cash receipts from Middlemount Coal Pty |  |  | 14.7 | 69.8 |
Middlemount Mine |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Income (Loss) from Equity Method Investments | $ 9.7 | 25.5 | $ 13.5 | 47.7 |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |
Depreciation, depletion and amortization and asset retirement obligation expenses | $ 3.5 | 4.2 | $ 7.1 | 8.1 |
Net interest expense | 1.8 | 3.6 | 4.0 | 7.2 |
Income tax provision | $ 4.2 | $ 6.4 | 5.9 | 11.5 |
Cash receipts from Middlemount Coal Pty |  |  | $ 14.7 | $ 69.8 |

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