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Business Segment and Geographic Information - Segment Revenue, Segment Profit or Loss, and Significant Segment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting [Abstract]    
Revenue $ 1,036.0 $ 921.0
Cost of sales 447.0 359.1
Payroll related expenses 220.2 199.8
Stock-based compensation expense 31.0 35.3
Marketing expense 70.4 61.5
Travel related expenses 19.6 21.0
Supply expenses and clinical trials 13.7 15.7
Consulting & professional fees 32.7 58.0
Equipment, office & facility expenses 21.5 22.2
IT software and data 35.1 32.1
Depreciation and amortization 9.2 11.7
Other segment items 1.9 3.5
Operating income 133.7 101.1
Other income, net 20.6 31.4
Income tax expense 48.9 (13.9)
Net income 105.4 146.4
Depreciation and amortization 60.0 52.5
Expenditures for long-lived assets 87.0 56.9
Deferred income taxes $ 5.8 $ 41.8