Share-Based Compensation Plans (Schedule Of Changes In Stock Options) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Share-Based Payment Arrangement [Abstract]
Option shares outstanding, December 31, 2021, Number of shares | shares	73,500
Option shares exercised, Number of shares | shares	(39.6)
Option shares outstanding, December 31, 2022, Number of shares | shares	33,900
Option shares exercisable, vested and expected to vest, December 31, 2022, Number of shares | shares	33,900
Option shares outstanding, December 31, 2021, Weighted-average exercise price | $ / shares	$ 46.05
Option shares exercised, Weighted-average exercise price | $ / shares	(44.93)
Option shares outstanding, December 31, 2022, Weighted-average exercise price | $ / shares	47.35
Option shares exercisable, vested and expected to vest, December 31, 2022. Weighted-average exercise price | $ / shares	$ 47.35
Option shares outstanding, December 31, 2022, Weighted-average remaining contractual term	1 year 1 month 6 days
Option shares exercisable, vested and expected to vest, December 31, 2022. Weighted-average remaining contractual term	1 year 1 month 6 days
Option shares outstanding, December 31, 2022, Aggregate intrinsic value | $	$ 0.7
Option shares exercisable, vested and expected to vest, December 31, 2022, Aggregate intrinsic value | $	$ 0.7