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Shareholders' Equity - Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 3.8	$ 4.1	$ 10.8	$ 9.9
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	0.6	0.6	1.6	1.5
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2.6	2.9	7.6	6.9
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	0.6	0.6	1.6	1.5
Mestrelab
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	0.3	$ 0.3	$ 1.1	$ 1.0
Stock options
Additional information
Weighted average remaining service period			2 years 8 months 12 days
Pre-tax stock-based compensation expense Stock options	3.3		$ 3.3
Restricted stock units
Additional information
Weighted average remaining service period			2 years 7 months 6 days
Pre-tax stock-based compensation expense restricted stock units	$ 30.5		$ 30.5