Contingencies (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014 Picton, Ontario facility	Jun. 30, 2013 Picton, Ontario facility	Jun. 30, 2014 Picton, Ontario facility	Jun. 30, 2013 Picton, Ontario facility	Jun. 30, 2014 Southern Pines and Mt. Airy Selling, General and Administrative Expenses
Site Contingency [Line Items]
Accrual for environmental investigation and remediation activities	$ 10.3	$ 6.9	$ 7.1
Loss contingency, range of possible loss, maximum	4.2
Increase in liability for environmental investigation and remediation				3.3	2.3	3.3	2.3
Recoveries from third-party commitments to share remediation costs								$ 0.8