Leases (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012 Corporations	Dec. 31, 2011	Dec. 31, 2010
Leases (Textual) [Abstract]
Income from leveraged leases, net of taxes	$ 0.2	$ 4.6	$ 1.5
Rental income from usage rents	18.2	13.7	11.8
Deferred initial direct costs of direct financial leases	$ 0.8	$ 0.9
Number of corporations	2

- Definition

For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease.

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