Pension Plans and Other Postretirement Benefits Pension and Postretirement Plan Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	$ 4.8	$ 5.2	$ 13.8	$ 7.5
Other Postretirement Benefits Payments	$ 0.9	0.8	2.9	$ 3.2
Rockwood Holdings, Inc. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected Contributions to Rockwood Pension Plans for the Remainder of 2015			$ 1.5
Antioxidant, Ibuprofen and Propofol Assets
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions		$ 4.3