Stock-Based Compensation - Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-Based Compensation
Total stock-based compensation	$ 4.1	$ 3.5	$ 9.9	$ 8.7
Minimum
Additional information
Vesting period			3 years
Maximum
Additional information
Vesting period			4 years
Cost of revenues
Stock-Based Compensation
Total stock-based compensation	0.6	0.5	$ 1.5	1.3
Selling, general and administrative
Stock-Based Compensation
Total stock-based compensation	2.9	2.5	6.9	6.1
Research and development
Stock-Based Compensation
Total stock-based compensation	0.6	0.5	1.5	1.3
Mestrelab Research, S.L. | Other charges (gain), net
Stock-Based Compensation
Total stock-based compensation	0.3	1.0	0.6	1.4
Stock options
Stock-Based Compensation
Total stock-based compensation	0.6	0.7	1.5	2.1
Additional information
Expected pre-tax stock-based compensation expense	2.7		$ 2.7
Weighted average remaining service period			1 year 10 months 24 days
Restricted stock awards
Stock-Based Compensation
Total stock-based compensation		0.1		0.3
Restricted stock units
Stock-Based Compensation
Total stock-based compensation	3.5	$ 2.7	$ 8.4	$ 6.3
Restricted stock units | 2016 Incentive Compensation Plan
Additional information
Expected pre-tax stock-based compensation expense	$ 25.3		$ 25.3
Weighted average remaining service period			2 years 7 months 6 days