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Long-term Debt - Receivables Facility (Details) - Receivables Facility [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 18, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 19, 2018
Debt Instrument [Line Items]          
Secured debt, Maximum Borrowing Capacity         $ 75.0
Debt cost, 1-month LIBOR plus   1.00% 1.00%    
Debt Instrument, Unused Borrowing Capacity, Fee percentage   0.35% 0.35%    
Receivables facility debt outstanding     $ 0.0    
Receivables facility debt available but not utilized     57.8    
Receivables facililty, debt aggregate costs $ 0.1   $ 1.0 $ 0.9