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Stockholders' Equity - Common Stock Shares Activity (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Purchases of treasury stock (8.0) (6.8)
Common Stock | Class A    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period 948.4 972.1
Purchases of treasury stock (8.0) (6.8)
Share-based payments 0.9 1.1
Conversion of Class B to Class A common stock 0.1 0.1
Balance at end of period 941.4 966.5
Common Stock | Class B    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period 7.6 7.8
Purchases of treasury stock 0.0 0.0
Share-based payments 0.0 0.0
Conversion of Class B to Class A common stock (0.1) (0.1)
Balance at end of period 7.5 7.7