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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2024
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, 2024 and 2023 is shown in the table below (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Stock options$— $0.1 $— $0.3 
Time-based restricted share units2.4 2.5 4.9 5.4 
Performance-based restricted share units1.4 1.3 2.4 2.1 
Employee stock purchase plan— — 0.1 0.1 
Total stock-based compensation$3.8 $3.9 $7.4 $7.9