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Debt - Credit Facility (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]            
Credit Agreement $ 50.0     $ 50.0   $ 0.0
Line of Credit Facility, Remaining Borrowing Capacity 150.0     150.0    
Gain (Loss) on Extinguishment of Debt 0.0 $ (1.3) $ 0.0 (1.3) $ 0.0  
Receivables facility amount outstanding 144.2     144.2   $ 0.0
Letters of Credit Outstanding, Amount 7.1     7.1    
Receivables Facility Remaining Borrowing Capacity 6.3     6.3    
Receivables Facility Maximum Borrowing Availability 157.6     157.6    
Accounts Receivable Facility, Renewal Term   364        
Receivables facility maximum borrowing capacity $ 250.0     $ 250.0    
London Interbank Offered Rate (LIBOR) [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   3.25%       3.75%
Base Rate [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   2.25%       2.75%