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Stock-Based Compensation
6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Stock-based compensation expense is included in “Cost of products sold,” “Research and development,” and “Sales and general expenses.” Stock-based compensation expense for the three and six months ended June 30, 2023 and 2022 is shown in the table below (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Stock options$0.1 $0.2 $0.3 $0.6 
Time-based restricted share units2.5 2.9 5.4 5.5 
Performance-based restricted share units1.3 0.8 2.1 1.5 
Employee stock purchase plan 0.1 0.1 0.2 
Total stock-based compensation$3.9 $4.0 $7.9 $7.8