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Business Segment and Geographic Information - Segment Revenue, Segment Profit or Loss, and Significant Segment Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting [Abstract]      
Revenue $ 4,033.0 $ 3,622.3 $ 2,909.8
Cost of sales 1,594.8 1,333.4 1,026.7
Payroll related expenses 767.1 726.9 621.1
Stock-based compensation expense 156.0 136.2 115.4
Marketing expense 298.7 264.6 228.3
Travel related expenses 64.8 55.3 37.6
Supply expenses and clinical trials 64.5 46.5 50.3
Consulting & professional fees 227.8 222.2 196.4
Equipment, office & facility expenses 83.8 84.7 80.3
IT software and data 130.6 106.6 86.5
Depreciation and amortization 39.9 41.9 46.7
Other segment items 5.0 6.3 29.3
Operating income 600.0 597.7 391.2
Other income (expense), net 109.0 112.7 (0.4)
Income before income taxes 709.0 710.4 390.8
Income tax expense 132.8 168.9 49.6
Net income 576.2 541.5 341.2
Depreciation and amortization 217.7 186.0 155.9
Expenditures for long-lived assets 358.8 236.6 364.8
Deferred income taxes $ 43.8 $ 55.0 $ 21.6