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Related Parties (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2012
Mitsubishi Corporation [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 15.9	$ 48.0
Stillwater Canada Inc [Member]
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners			25.00%
Stillwater Canada Inc [Member] \| Mitsubishi Corporation [Member]
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	25.00%

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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