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Stockholders' Equity - Common Stock Shares Activity (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Purchases of treasury stock     (19.2) (18.3)
Common Stock | Class A        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 935.9 960.0 948.4 972.1
Purchases of treasury stock (4.8) (4.7) (19.2) (18.3)
Share-based payments 0.5 0.1 2.2 1.5
Conversion of Class B to Class A common stock 0.0 0.0 0.2 0.1
Balance at end of period 931.6 955.4 931.6 955.4
Common Stock | Class B        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 7.4 7.7 7.6 7.8
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 (0.2) (0.1)
Balance at end of period 7.4 7.7 7.4 7.7