Commitments and Contingencies (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Accrued expenses	$ 1.4	$ 1.3
Other liabilities	3.7	3.1
Total	5.1	4.4
Undiscounted liabilities	$ 5.0	$ 4.7
Minimum [Member]
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Discount rate	2.30%	3.10%
Maximum [Member]
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Discount rate	3.00%	4.70%