Segment Information Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Jan. 12, 2015
Cost of goods sold
Segment Reporting Information [Line Items]
Utilization of inventory markup	$ 7.7	$ 75.4
Equity in net income of unconsolidated investments
Segment Reporting Information [Line Items]
Utilization of inventory markup	9.1	26.9
Rockwood Holdings, Inc.
Segment Reporting Information [Line Items]
Inventory markup			$ 103.0
Utilization of inventory markup	$ 16.8	$ 102.3