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Stockholders’ Deficit - Stock repurchase program (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jul. 31, 2023
Feb. 28, 2022
Class of Stock [Line Items]        
Stock repurchase program, authorized amount       $ 1,200.0
Stock repurchase program, additional authorized amount $ 1,200.0   $ 1,200.0  
Class A        
Class of Stock [Line Items]        
Stock repurchased and retired during period (in shares) 49.5 22.7    
Stock repurchased and retired during period, aggregate purchase price $ 1,200.0 $ 542.8