Income Taxes	9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's income tax provision of $79.4 million and income tax benefit of $18.6 million for the three months ended September 30, 2014 and 2013, respectively, include remeasurement benefits related to foreign tax accounts of $1.2 million and $2.6 million, respectively. The Company's income tax provision of $30.9 million and income tax benefit of $199.6 million for the nine months ended September 30, 2014 and 2013, respectively, include remeasurement benefits related to foreign tax accounts of $3.9 million and $38.1 million, respectively. The Company's 2014 effective tax rate before remeasurement is based on the Company's estimated full year effective tax rate, which is comprised of the expected statutory tax expense offset by reductions from percentage depletion and foreign rate differential. The Company wrote-off deferred tax assets of $70.1 million during the three months ended September 30, 2014 related to the repeal of the Australian Minerals and Resource Rent Tax, including $54.0 million of related royalty allowance credits recognized during the first half of the year. The Company also recorded a valuation allowance on certain Australian deferred tax assets not considered more likely than not to be realized amounting to $80.6 million and $252.2 million during the three and nine months ended September 30, 2014, respectively. The Company released a portion of its valuation allowance on U.S. capital loss carryforwards amounting to $25.5 million during the nine months ended September 30, 2013 due to a change in expected realization upon the sale of non-strategic U.S. coal reserves and surface lands. During the three and nine months ended September 30, 2014, the Company decreased its net unrecognized tax benefits, interest and penalties by $70.7 million and $119.1 million, respectively, due to amended returns filed and finalization of Australian Tax Office audits on the 2004 through 2012 tax years. During the nine months ended September 30, 2014, the U.S. Internal Revenue Service added the 2011 through 2013 tax years to an in-process 2009 through 2010 audit due to amended returns filed for capital and net operating loss carrybacks. The Company believes that during the next twelve months it is reasonably possible it will recognize a $23.6 million decrease in its net unrecognized tax benefits due to potential audit settlements.

Income Taxes

The Company's income tax provision of $79.4 million and income tax benefit of $18.6 million for the three months ended September 30, 2014 and 2013, respectively, include remeasurement benefits related to foreign tax accounts of $1.2 million and $2.6 million, respectively. The Company's income tax provision of $30.9 million and income tax benefit of $199.6 million for the nine months ended September 30, 2014 and 2013, respectively, include remeasurement benefits related to foreign tax accounts of $3.9 million and $38.1 million, respectively. The Company's 2014 effective tax rate before remeasurement is based on the Company's estimated full year effective tax rate, which is comprised of the expected statutory tax expense offset by reductions from percentage depletion and foreign rate differential.

The Company wrote-off deferred tax assets of $70.1 million during the three months ended September 30, 2014 related to the repeal of the Australian Minerals and Resource Rent Tax, including $54.0 million of related royalty allowance credits recognized during the first half of the year. The Company also recorded a valuation allowance on certain Australian deferred tax assets not considered more likely than not to be realized amounting to $80.6 million and $252.2 million during the three and nine months ended September 30, 2014, respectively. The Company released a portion of its valuation allowance on U.S. capital loss carryforwards amounting to $25.5 million during the nine months ended September 30, 2013 due to a change in expected realization upon the sale of non-strategic U.S. coal reserves and surface lands.

During the three and nine months ended September 30, 2014, the Company decreased its net unrecognized tax benefits, interest and penalties by $70.7 million and $119.1 million, respectively, due to amended returns filed and finalization of Australian Tax Office audits on the 2004 through 2012 tax years. During the nine months ended September 30, 2014, the U.S. Internal Revenue Service added the 2011 through 2013 tax years to an in-process 2009 through 2010 audit due to amended returns filed for capital and net operating loss carrybacks. The Company believes that during the next twelve months it is reasonably possible it will recognize a $23.6 million decrease in its net unrecognized tax benefits due to potential audit settlements.