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Income Taxes (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |  |  |
Operating Income (Loss) |  | $ 6,300.0 |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Alternative minimum tax credits |  | 264.3 |  |
General business credits |  | 119.4 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  | 2,340.4 |  |
State net operating loss carryforwards |  | 127.9 |  |
Deferred Tax Assets, Charitable Contribution Carryforwards |  | 1.3 |  |
Foreign loss carryforwards included in Company's tax credits and loss carryforwards |  | 1,102.2 |  |
Valuation allowance reserve for U.S. capital losses, state NOLs, foreign NOLs and certain foreign deferred tax assets | $ (1,447.3) | (3,881.2) | $ (1,447.3) |
Minerals resource rent tax, net of federal tax |  | 0.0 | 0.0 | $ 16.1
Change in unrecognized tax benefit |  | 2.8 |  |
Net unrecognized tax benefits | 19.6 | 20.1 | 19.6 |
Accrued interest related to unrecognized tax benefits included in income tax provision |  | 0.4 | 2.1 | $ 8.0
Accrued interest related to uncertain tax positions | 0.4 | 2.4 | $ 0.4 |
Australia Deferred Tax Assets [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount |  | 91.0 |  |
US Deferred Tax Assets [Member] |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |
Capital loss |  | 60.8 |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ (177.0) | $ 2,342.9 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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