Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
U.S. Federal benefit	$ (0.1)	$ (0.1)	$ (0.2)
State and local tax (benefit)	0.1	(0.2)	0.1
Total current		(0.3)	(0.1)
Deferred:
U.S. Federal tax (benefit)			(0.3)
State and local tax
Total deferred			(0.3)
Total income benefit		$ (0.3)	$ (0.4)