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Debt and Other Financing Arrangements - Accounts Receivable Securitization Facility (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2016
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Accounts Receivable Sold $ 20,000,000      
Receivables facility maximum borrowing capacity 225,000,000   $ 250,000,000  
Receivables facility maximum borrowing availability 193,700,000      
Receivables facility amount outstanding 176,600,000     $ 0
Long-term Line of Credit 18,000,000     $ 0
Letters of Credit Outstanding, Amount 8,200,000      
Receivables Facility Remaining Borrowing Capacity $ 9,100,000      
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.00% 1.00%    
Receivables Facilities [Member]        
Debt Instrument [Line Items]        
Letters of Credit Outstanding, Amount $ 8,000,000      
Debt Instrument, Interest Rate During Period 3.20%      
Receivables Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.10%