Other Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other Assets [Abstract]
Restricted Cash and Cash Equivalents	$ 0	$ 8.3
Unamortized Debt Issuance Expense	5.9	6.9
Capitalized Computer Software, Net	$ 8.6	$ 4.4

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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