Earnings Per Share (Narrative) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per common share	$ 3.60	$ 3.44
Contingently Issuable Shares [Member] | Class B Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares excluded from earnings per share	1,000
Stock Options and Contingently Issuable Shares [Member] | Class B Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares excluded from earnings per share		105,000