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Accounts Receivable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation Allowances and Allowances for Doubtful Accounts   $ 13.5 $ 4.0  
Other long-term liabilities   51.2 52.8  
Government [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts Receivable, Gross, Noncurrent   76.5 80.8 38.0
Proceeds from DOE on Claims 1.4 4.7    
Valuation Allowances and Allowances for Doubtful Accounts   55.3 55.0  
Accounts Receivable, Net, Noncurrent   21.2 25.8  
Other long-term liabilities   19.6 19.7  
Government - portion related to retiree benefits [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accounts Receivable, Gross, Noncurrent   $ 42.8