Shareholders' Earnings per Share - Denominator for Basic and Diluted Earnings per Share (Details) - shares shares in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Earnings Per Share [Abstract] | ||||
| Denominator for basic shareholders' earnings per share – weighted-average shares (in shares) | 216.6 | 223.3 | 217.8 | 225.0 |
| Effect of dilutive securities – employee stock options, non-vested restricted stock awards and convertible debentures (in shares) | 1.0 | 0.4 | 0.8 | 0.6 |
| Denominator for diluted shareholders' earnings per share (in shares) | 217.6 | 223.7 | 218.6 | 225.6 |