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Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 06, 2017
Disaggregation of Revenue
Sales	$ 290.1	$ 272.2	$ 277.9	$ 244.1	$ 269.4	$ 202.7	$ 199.8	$ 171.0	$ 1,084.3	$ 842.9	$ 722.0
Cost of sales									788.4	611.3	512.3
Advertising costs									4.0	4.2	3.8
Research and development expense									11.1	7.1	7.6
Total future minimum lease payments	$ 39.6								39.6
Shipping
Disaggregation of Revenue
Sales									11.4	8.5	6.9
Cost of sales									$ 16.9	$ 11.1	$ 9.5
Minimum
Disaggregation of Revenue
Finite lived intangible asset useful life									2 years
Maximum
Disaggregation of Revenue
Finite lived intangible asset useful life									15 years
Convertible Debt \| Convertible Notes, due 2024
Disaggregation of Revenue
Debt instrument stated interest rate (percent)	1.00%								1.00%			1.00%