Share-Based Compensation Plans (Schedule Of Changes In Stock Options) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Share-Based Payment Arrangement [Abstract]
Option shares outstanding, December 31, 2022, Number of shares | shares	33,900
Option shares exercised, Number of shares | shares	(27,700)
Option shares outstanding, December 31, 2023, Number of shares | shares	6,200
Option shares exercisable, vested and expected to vest, December 31, 2023, Number of shares | shares	6,200
Option shares outstanding, December 31, 2022, Weighted-average exercise price | $ / shares	$ 47.35
Option shares exercised, Weighted-average exercise price | $ / shares	47.01
Option shares outstanding, December 31, 2023, Weighted-average exercise price | $ / shares	48.86
Option shares exercisable, vested and expected to vest, December 31, 2023, Weighted-average exercise price | $ / shares	$ 48.86
Option shares outstanding, December 31, 2023, Weighted-average remaining contractual term	4 months 24 days
Option shares exercisable, vested and expected to vest, December 31, 2023, Weighted-average remaining contractual term	4 months 24 days
Option shares outstanding, December 31, 2023, Aggregate intrinsic value | $	$ 0.3
Option shares exercisable, vested and expected to vest, December 31, 2023, Aggregate intrinsic value | $	$ 0.3