Consolidated Statement of Changes in Equity (Parenthetical) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash dividends declared (USD per share)		$ 4.98	$ 4.58	$ 4.27
Retained Earnings
Acquisition and surrender of common shares	[1]	$ 41.1	$ 36.6	$ 170.5

[1] For accounting purposes, the Company treats repurchased shares as constructively retired when acquired and accordingly charges the purchase price against Common Stock par value, Additional paid-in capital, to the extent available, and Retained earnings. The change in Retained earnings of $41.1 million, $36.6 million and $170.5 million in 2024, 2023 and 2022, respectively, reflects this accounting treatment.