Contingent Liabilities and Commitments (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Environmental Matters [Abstract]
Aggregate, Loss Exposure Not Accrued, Low Estimate	$ 5
Aggregate, Loss Exposure Not Accrued, High Estimate	7.0
Accrual for Environmental Loss Contingencies, Total	4.0	3.3
Accrued Environmental Loss Contingencies, Current	2.8	1.1
Accrued Environmental Loss Contingencies, Noncurrent	1.2	2.2
Estimated Capital Costs For Compliance With Hazardous Air Pollutant Regulations	1
Potentially Responsible Party At Various Superfund And State Waste Disposal Sites [Member]
Environmental Matters [Abstract]
Aggregate, Loss Exposure Not Accrued, High Estimate	0.5
Environmental Restoration Costs [Member]
Environmental Matters [Abstract]
Regulatory Assets	$ 0.7	$ 0
Minimum [Member]
Environmental Matters [Abstract]
Expected Duration Of Environmental Assessment And Remediation Spending	3 years
Maximum [Member]
Environmental Matters [Abstract]
Expected Duration Of Environmental Assessment And Remediation Spending	5 years