Consolidated Statement of Changes in Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Common stock, dividends declared (USD per share)	$ 4.27	$ 3.99		$ 3.71
Retained Earnings
Acquisition and surrender of common shares	$ 170.5	$ 15.8	[1]	$ 34.1	[1]

[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 $170.5 million, $15.8 million and $34.1 million in 2022, 2021 and 2020, respectively, reflects this accounting treatment.