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Debt - Credit Facility (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]          
Credit Agreement $ 0.0   $ 0.0    
Line of Credit Facility, Remaining Borrowing Capacity 200.0   200.0    
Gain (Loss) on Extinguishment of Debt (1.3) $ 0.0 (1.3) $ 0.0  
Receivables facility amount outstanding 0.0   0.0    
Letters of Credit Outstanding, Amount 6.7   6.7    
Receivables Facility Remaining Borrowing Capacity 154.2   154.2    
Receivables Facility Maximum Borrowing Availability $ 160.9   160.9    
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%   3.25%   3.75%
Base Rate [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.25%   2.25%   2.75%