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Stockholders' Equity - Common Stock Shares Activity (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Purchases of treasury stock     (10.2) (14.4)
Common Stock | Class A        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 924.2 941.4 927.3 948.4
Purchases of treasury stock (5.8) (6.5) (10.2) (14.4)
Share-based payments 0.1 0.9 1.3 1.7
Conversion of Class B to Class A common stock 0.0 0.1 0.1 0.2
Balance at end of period 918.5 935.9 918.5 935.9
Common Stock | Class B        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 7.1 7.5 7.2 7.6
Purchases of treasury stock 0.0 0.0 0.0 0.0
Share-based payments 0.0 0.0 0.0 0.0
Conversion of Class B to Class A common stock 0.0 (0.1) (0.1) (0.2)
Balance at end of period 7.1 7.4 7.1 7.4