Stockholders' Equity - Statement of Changes in Common Shares Outstanding (Details) - shares shares in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Class A Common Stock | |||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||
| Purchases of treasury stock | (21.1) | (23.0) | (23.8) |
| Common Stock | Class A Common Stock | |||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||
| Balance | 906.6 | 927.3 | 948.4 |
| Purchases of treasury stock | (21.1) | (23.0) | (23.8) |
| Share-based payments | 1.6 | 1.9 | 2.3 |
| Conversion of Class B to Class A common stock | 0.2 | 0.4 | 0.4 |
| Balance | 887.3 | 906.6 | 927.3 |
| Common Stock | Class B Common Stock | |||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||
| Balance | 6.8 | 7.2 | 7.6 |
| Purchases of treasury stock | 0.0 | 0.0 | 0.0 |
| Share-based payments | 0.0 | 0.0 | 0.0 |
| Conversion of Class B to Class A common stock | (0.2) | (0.4) | (0.4) |
| Balance | 6.6 | 6.8 | 7.2 |