Prepaid Expenses and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Components of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets were as follows:

	As of
(in millions)	September 30, 2017		December 31, 2016
Deferred cost of sales - toll customers	$	8.3	$	4.0
Workers’ compensation plan deposits	4.1		6.3
Derivative contract assets	3.4		2.8
Prepaid insurance	1.9		1.7
Other	3.7		3.5
Total prepaid expenses and other current assets	$	21.4	$	18.3