Segment Information Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jan. 12, 2015
Cost of goods sold
Segment Reporting Information [Line Items]
Utilization of inventory markup	$ 27.3	$ 67.6
Equity in net income of unconsolidated investments
Segment Reporting Information [Line Items]
Utilization of inventory markup	10.0	17.9
Rockwood Holdings, Inc.
Segment Reporting Information [Line Items]
Inventory markup			$ 103.0
Utilization of inventory markup	$ 37.3	$ 85.5