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Equity Method Investments and Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Apr. 01, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity method investments and financing receivables	$ 66.9		$ 66.9		$ 84.8
Middlemount Mine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Interest rate terms			15.00%
Financing Receivable | Middlemount Mine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days available cash not required to pay known bills			35 days
Available cash distribution to stockholders ratio			50.00%
Available cash distribution to company if no marketing royalty payment overdue			100.00%
Financing receivable, cash received from equity Interest	$ 21.0	$ 31.1		$ 2.1
Intercompany loans					$ 50.0
Australian Bank Bill Swap Reference Rate | Middlemount Mine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread over Australian Bank Bill Swap Reference Rate			3.50%

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Intercompany Loans

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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