Earnings Per Share (Schedule of Earnings Per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 623.0	$ 617.0	$ 415.0
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	66,900	67,800	65,400
Equivalent shares from outstanding stock options	800	500	400
Weighted Average Number of Shares Outstanding, Diluted	67,700	68,300	65,800
Basic earnings per share:
Earnings Per Share, Basic (in dollars per share)	$ 9.31	$ 9.10	$ 6.35
Earnings Per Share, Diluted (in dollars per share)	$ 9.21	$ 9.04	$ 6.31
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 627.0	$ 617.0	$ 415.0
Net Income (Loss) Attributable to Noncontrolling Interest	$ 4.0	$ 0.0	$ 0.0