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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Total revenue $ 753.2 $ 678.4 $ 690.6
Costs and expenses:      
Research and development expense 88.7 85.4 81.9
Selling, general, and administrative expense 572.9 514.7 537.8
Legal settlements 112.8 0.0 62.0
Goodwill and long-lived asset impairment charges 0.0 16.9 1.8
Total costs and expenses 1,010.6 819.0 881.1
Operating loss (257.4) (140.6) (190.5)
Other income (expense):      
Interest income 2.5 2.6 0.7
Interest expense (2.9) (3.2) (6.6)
Other (4.4) 0.6 139.3
Total other income (expense) (4.8) 0.0 133.4
Loss before income tax (262.2) (140.6) (57.1)
Income tax expense (benefit) 1.1 (28.6) (29.9)
Net loss $ (263.3) $ (112.0) $ (27.2)
Net loss per share:      
Basic (in dollars per share) $ (3.18) $ (1.39) $ (0.35)
Diluted (in dollars per share) $ (3.18) $ (1.39) $ (0.35)
Weighted average shares outstanding:      
Basic (in shares) 82.8 80.6 78.0
Diluted (in shares) 82.8 80.6 78.0
Testing Revenue      
Total revenue $ 753.2 $ 678.4 $ 666.4
Costs and expenses:      
Costs and expenses 236.2 202.0 185.7
Other revenue      
Total revenue 0.0 0.0 24.2
Costs and expenses:      
Costs and expenses $ 0.0 $ 0.0 $ 11.9