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Accounts Receivable (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other long-term liabilities $ 35.6 $ 38.6
Government [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Net, Noncurrent 14.2 22.8
Other long-term liabilities $ 19.3 $ 19.3