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Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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-Topic 210

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-Section S99

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Cash receipts from customers during the current period which are usually for sales of goods and services.

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Accounts Receivable (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance and allowance for doubtful accounts		$ 0.6	$ 4.0
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross, Noncurrent		75.0	81.0	38.0
Proceeds from DOE on Claims	6
Accounts Receivable, Net, Noncurrent		19.9	25.8
Other long-term liabilities		19.6	19.7
Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross, Noncurrent		3.8
Government - portion related to retiree benefits [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross, Noncurrent		42.8
Government - portion related to duplicative credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross, Noncurrent		$ 1.6