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Accounting Policies Deferred Financing Costs (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Deferred Finance Costs, Gross Carrying Value	$ 16.1	$ 13.8
Deferred Financing Costs, Accumulated Amortization	7.6	6.7
Deferred Financing Costs, Net	$ 8.5	$ 7.1

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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