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Stockholders' Equity - Common Stock Shares Activity (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Purchases of treasury stock     (16.5) (19.2)
Common Stock | Class A        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 918.5 935.9 927.3 948.4
Purchases of treasury stock (6.3) (4.8) (16.5) (19.2)
Share-based payments 0.4 0.5 1.7 2.2
Conversion of Class B to Class A common stock 0.0 0.0 0.1 0.2
Balance at end of period 912.6 931.6 912.6 931.6
Common Stock | Class B        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 7.1 7.4 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 0.0 (0.1) (0.2)
Balance at end of period 7.1 7.4 7.1 7.4