Contingencies (Details) (USD $) In Millions, unless otherwise specified				9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014 Picton, Ontario facility	Sep. 30, 2013 Picton, Ontario facility	Sep. 30, 2014 Southern Pines and Mt. Airy Selling, general and administrative expenses	Sep. 30, 2013 Southern Pines and Mt. Airy Selling, general and administrative expenses
Site Contingency [Line Items]
Accrual for environmental investigation and remediation activities	$ 10.0	$ 6.9	$ 7.2
Loss contingency, range of possible loss, maximum	4.2
Liability for environmental investigation and remediation				3.3	2.3
Recoveries from third-party commitments to share remediation costs						$ 0.8	$ 1.6