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Shareholders' Equity - Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	$ 13.3	$ 11.9	$ 11.3
Additional information
Expected pre-tax stock-based compensation expense	$ 24.9
Weighted average remaining service period	2 years 7 months 6 days
Minimum \| 2016 Incentive Compensation Plan
Additional information
Vesting period	1 year
Maximum \| 2016 Incentive Compensation Plan
Additional information
Vesting period	4 years
Cost of revenues
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	$ 2.0	1.8	1.7
Selling, general and administrative
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	9.3	8.3	7.9
Research and development
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	2.0	1.8	1.7
Mestrelab
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	2.6	2.3	0.5
Stock options
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	$ 1.8	2.7	4.2
Stock options \| Minimum
Additional information
Vesting period	3 years
Stock options \| Maximum
Additional information
Vesting period	4 years
Restricted stock awards
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation		0.3	0.8
Restricted stock units
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Stock-based compensation	$ 11.5	$ 8.9	$ 6.3