Summary of Significant Accounting Policies and Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Average collection cycle for accounts receivable (in days)	60 days
Percentage of FIFO inventory	92.30%	91.20%
Inventory, LIFO Reserve	$ 3.9	$ 3.5
Stock-based compensation expense	11.1	6.3	$ 2.3
Research and development costs	39.4	35.2	$ 33.2
Deferred financing fees	$ 26.4	$ 36.5