Acquisition, Textuals (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					24 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Alexco	Dec. 31, 2010 Alexco	Dec. 31, 2011 Alexco	Jan. 03, 2011 Alexco	Aug. 09, 2010 Nichols	Aug. 09, 2010 Nichols Promissory Note	Dec. 31, 2010 Nichols Promissory Note Nichols	Aug. 09, 2010 Nichols Promissory Note Nichols
Business Acquisition [Line Items]
Net cash consideration paid	$ 0	$ 83.2	$ 9.0	$ 83.2						$ 9.0
Liabilities assumed from acquisition							1.0				2.1
Acquisition related costs				0.1	0.4	0.5				0.8
Other Notes Payable									$ 6.7		$ 6.7
Period for goodwill expected to be deductible for income tax purposes							15 years	15 years