Stockholders' Equity - Common Stock Shares Activity (Details) - shares shares in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||
| Purchases of treasury stock | (4.7) | (4.4) |
| Common Stock | Class A | ||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||
| Balance at beginning of period | 906.6 | 927.3 |
| Purchases of treasury stock | (4.7) | (4.4) |
| Share-based payments | 1.1 | 1.2 |
| Conversion of Class B to Class A common stock | 0.0 | 0.1 |
| Balance at end of period | 903.0 | 924.2 |
| Common Stock | Class B | ||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||
| Balance at beginning of period | 6.8 | 7.2 |
| Purchases of treasury stock | 0.0 | 0.0 |
| Share-based payments | 0.0 | 0.0 |
| Conversion of Class B to Class A common stock | 0.0 | (0.1) |
| Balance at end of period | 6.8 | 7.1 |