Segment and Geographic Area Information Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jan. 12, 2015
Rockwood Holdings, Inc.
Segment Reporting Information [Line Items]
Inventory markup			$ 103.0
Utilization of inventory markup	$ 103.0
Rockwood Holdings, Inc. | Cost of Sales
Segment Reporting Information [Line Items]
Utilization of inventory markup	75.9
Rockwood Holdings, Inc. | Equity in Net Income of Unconsolidated Investments
Segment Reporting Information [Line Items]
Utilization of inventory markup	27.1
Refining Solutions | Fabrica Carioca de Catalisadores S.A.
Segment Reporting Information [Line Items]
Unconsolidated investment impairment charges	2.0
Corporate | Rockwood Holdings, Inc.
Segment Reporting Information [Line Items]
Acquisition financing-related fees	$ 4.4	$ 17.5