Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable
Notes, Loans and Financing Receivable, Purchase of Company Shares	$ 30.0
Loans Payable	1.2	1.5
Employee Stock Ownership Plan (ESOP), Plan | Loans Receivable
Accounts, Notes, Loans and Financing Receivable
Notes, Loans and Financing Receivable, Repay Third Party Debt	0.5
Notes, Loans and Financing Receivable, Purchase of Company Shares	1.0
Loans Payable	$ 1.2	$ 1.5