Acquisitions and Strategic Investments (2015 Specialty Finishing Acquisition) (Details) - USD ($) $ in Millions		9 Months Ended
	Aug. 25, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired		$ 140.8	$ 112.5
Goodwill		$ 5.7		$ 775.5
Specialty Finishing [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 61.8
Payments to acquire businesses, net of cash acquired	61.7
Cash acquired from acquisition	0.1
Identifiable intangible assets	$ 13.3
Weighted average useful life of identifiable intangible assets	6 years
Goodwill	$ 5.7