CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 234.0	$ 192.1	$ 658.3	$ 528.8
Cost of revenue	82.2	69.0	237.1	182.6
Gross profit	151.8	123.1	421.2	346.2
Operating expenses:
Research and development expenses	38.8	31.3	108.5	96.8
Selling, general and administrative expenses	89.2	74.8	253.9	217.5
Operating income	23.8	17.0	58.8	31.9
Interest expense, net	(11.4)	(7.7)	(32.6)	(18.3)
Loss on extinguishment of debt	0.0	(6.4)	0.0	(6.4)
Other income (expense), net	1.0	(1.8)	2.0	0.5
Income before income taxes	13.4	1.1	28.2	7.7
Income tax expense	(1.8)	(0.3)	(4.3)	(1.1)
Net income	$ 11.6	$ 0.8	$ 23.9	$ 6.6
Net income per share:
Basic (in dollars per share)	$ 0.18	$ 0.01	$ 0.37	$ 0.11
Diluted (in dollars per share)	$ 0.17	$ 0.01	$ 0.36	$ 0.11
Weighted-average number of common shares outstanding:
Basic (in shares)	65,717,820	60,743,211	64,329,181	59,986,163
Diluted (in shares)	66,827,692	62,335,679	65,598,197	61,728,018