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Accounts Receivable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent     $ 38.0
Valuation Allowances and Allowances for Doubtful Accounts 4.6 4.0  
Other long-term liabilities 51.7 52.8  
Government [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent 80.8 80.8  
Valuation Allowances and Allowances for Doubtful Accounts 55.0 55.0  
Accounts Receivable, Net, Noncurrent 25.8 25.8  
Other long-term liabilities 19.7 19.7  
Government - portion related to retiree benefits [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent $ 42.8