Contingencies (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Accrual for environmental investigation and remediation activities	$ 10,300,000	$ 10,300,000	$ 9,300,000	$ 9,700,000
Loss contingency, range of possible loss, minimum			0
Loss contingency, range of possible loss, maximum			$ 4,935,000.000
Picton, Ontario Facility
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, provision for new losses	$ 3,300,000	$ 3,300,000