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Accounts Receivable (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Valuation allowance and allowance for doubtful accounts $ 0.6 $ 0.6
Other long-term liabilities 53.7 54.6
Government [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Gross, Noncurrent 75.0 75.0
Accounts Receivable, Net, Noncurrent 19.9 19.9
Other long-term liabilities $ 19.5 $ 19.6