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Accounts Receivable (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent     $ 38.0
Other long-term liabilities $ 31.9 $ 38.6  
Government [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent   78.0  
Accounts Receivable, Net, Noncurrent   22.8  
Other long-term liabilities 19.4 19.3  
Proceeds on claims   6.7  
Government - portion related to retiree benefits [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent   42.8  
Corporation [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts Receivable, Gross, Noncurrent   $ 3.8  
Proceeds on claims $ 0.4