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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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