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Equity Method Investments and Financing Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Apr. 01, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Equity method investments and financing receivables | $ 66.9 |  | $ 66.9 |  | $ 84.8
Middlemount Mine |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |
Interest rate terms |  |  | 15.00% |  |
Financing Receivable | Middlemount Mine |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of days available cash not required to pay known bills |  |  | 35 days |  |
Available cash distribution to stockholders ratio |  |  | 50.00% |  |
Available cash distribution to company if no marketing royalty payment overdue |  |  | 100.00% |  |
Financing receivable, cash received from equity Interest | $ 21.0 | $ 31.1 |  | $ 2.1 |
Intercompany loans |  |  |  |  | $ 50.0
Australian Bank Bill Swap Reference Rate | Middlemount Mine |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Basis spread over Australian Bank Bill Swap Reference Rate |  |  | 3.50% |  |

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