Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Taxes [Abstract]
Effective tax rate	38.10%	38.50%
Unrecognized tax benefits	$ 1.2		$ 1.3
Unrecognized tax benefits if recognized would reduce effective tax rate in future periods	1.2
Income taxes paid	$ 0.3	$ 0.8