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Financing Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2011 | Dec. 31, 2012
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Other current assets | $ 486.6 |  | $ 447.6 |  | $ 486.6 | $ 486.6 | $ 447.6 |  |  |
Interest income |  |  |  |  | 4.0 | 5.7 | 7.7 | $ 15.4 |  |
Asset Impairment | $ 230.7 | $ 17.2 | 377.0 | $ 900.8 | $ 230.7 | $ 247.9 | 1,277.8 | $ 154.4 |  |
Middlemount Mine [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |
Basis spread over Australian Bank Bill Swap Reference Rate |  |  |  |  |  | 3.50% |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  |  |  | 0.15 |  |  |  |
Codrilla Mine Project [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of ownership before selldown |  |  |  |  |  |  |  |  | 85.00% |
Percentage of agreed sale price as final installment payment due | 40.00% |  |  |  | 40.00% | 40.00% |  |  |  |
Financing Receivable [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Other current assets | $ 0.0 |  | 20.0 |  | $ 0.0 | $ 0.0 | 20.0 |  |  |
Investments and other assets | 84.8 |  | 65.2 |  | 84.8 | 84.8 | 65.2 |  |  |
Total financing receivables | 84.8 |  | 85.2 |  | 84.8 | 84.8 | 85.2 |  |  |
Financing Receivable [Member] | Middlemount Mine [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Investments and other assets | 84.8 |  | 65.2 |  | 84.8 | 84.8 | 65.2 |  |  |
Intercompany Loans | $ 60.0 |  |  |  | $ 60.0 | $ 60.0 |  |  |  |
Financing Receivable [Member] | Codrilla Mine Project [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Investments and other assets |  |  | $ 20.0 |  |  |  | $ 20.0 |  |  |
Middlemount Mine [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |
Coppabella, Moorvale, and Codrilla Mines [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivables [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of undivided interests acquired |  |  |  |  |  |  |  |  |  | 73.30%

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