Commitments and Contingencies (Details 2) AUD in Millions, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2016 AUD sites	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2016 USD ($)
Monto Coal Pty Limited [Member]
Loss Contingency [Abstract]
Ownership percentage in subsidiaries				51.00%
Loss Contingency Damages Sought Minimum	AUD 15.6
Loss Contingency Damages Sought Value Max	1,800.0
Wilkie Creek [Member]
Loss Contingency [Abstract]
Damages sought	113.1
Potential Annual Payments Awarded	11.8
Payment Sought by Australia Supreme Court	AUD 11.8
Charge to discontinued operations | $		$ 7.6	$ 9.7
Blue Tee [Member]
Loss Contingency [Abstract]
Number of national priority list sites based on the Superfund Amendments and Reauthorization Act of 1986 at which Gold Fields or the former affiliate, has been named a potentially responsible party (PRP) | sites	6
Number of additional national priority list sites in which CERCLA claims were asserted | sites	12
Gold Fields [Member]
Loss Contingency [Abstract]
Number of national priority list sites based on the Superfund Amendments and Reauthorization Act of 1986 at which Gold Fields or the former affiliate, has been named a potentially responsible party (PRP) | sites	4
Undiscounted environmental clean-up liabilities, total | $			$ 66.9	$ 62.9
Senior Notes [Member]
Loss Contingency [Abstract]
Debt Instrument, Face Amount | $				$ 1,650.0