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Lease Commitments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases [Abstract]
Lease Obligations Maturity Subleases	2017
Lease Obligations Maturity	2022
Operating Leases Future Minimum Payments Due Future Minimum Abandoned Leases	$ 3.6
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	2.9
Operating Leases, Rent Expense, Minimum Rentals	$ 28.7	$ 27.8	$ 27.3

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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