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Segment Information - Other Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting [Abstract]          
Stock‐based compensation expense $ 69.9 $ 64.3 $ 136.8 $ 127.3  
Depreciation and amortization 38.3 29.2 74.1 57.8  
Total assets 10,641.4 8,052.9 10,641.4 8,052.9 $ 9,763.1
Purchases of property and equipment $ 167.8 $ 23.1 $ 234.3 $ 245.0