Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Number of shares authorized to be repurchased	11.8
Purchase of treasury stock	$ 441.3	$ 105.8
Treasury stock acquired, Shares,	7.2	1.8
Treasury Stock Acquired, Average Cost Per Share	$ 61.5	$ 60.24
Common stock reissued	2.9	2.6