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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment
Number Of Unconsolidated Subsidiaries	0dw_NumberOfUnconsolidatedSubsidiaries
Manufacturing Facility
Property, Plant and Equipment
Manufacturing Facilities	37
Selling, General and Administrative Expenses [Member]
Property, Plant and Equipment
Shipping, Handling and Transportation Costs	$ 40.9	$ 36.4	$ 32.7

Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.