Share-Based Compensation Plans (Schedule Of Changes In Stock Options) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Option shares outstanding, December 31, 2015, Number of shares | shares	1,410,300
Option shares exercised, Number of shares | shares	(25,600)
Options forfeited, Number of shares | shares	(23,500)
Net impact as a result of AFI separation, Number of shares | shares	(10,600)
Option shares outstanding, December 31, 2016, Number of shares | shares	1,350,600
Option shares exercisable, December 31, 2016, Number of shares | shares	1,276,700
Option shares vested and expected to vest, December 31, 2016, Number of shares | shares	1,350,300
Option shares outstanding, December 31, 2015, Weighted-average exercise price | $ / shares	$ 40.66
Option shares exercised, Weighted-average exercise price | $ / shares	(26.26)
Options forfeited, Weighted-average exercise price | $ / shares	(45.68)
Net impact as a result of AFI separation, Weighted-average exercise price | $ / shares	(44.21)
Option shares outstanding, December 31, 2016, Weighted-average exercise price | $ / shares	34.66
Option shares exercisable, December 31, 2016, Weighted-average exercise price | $ / shares	33.94
Option shares vested and expected to vest, December 31, 2016, Weighted-average exercise price | $ / shares	$ 34.66
Option shares outstanding, December 31, 2016, Weighted-average remaining contractual term	4 years 6 months
Option shares exercisable, December 31, 2016, Weighted-average remaining contractual term	4 years 6 months
Option shares vested and expected to vest, December 31, 2016, Weighted-average remaining contractual term	4 years 6 months
Option shares outstanding, December 31, 2016, Aggregate intrinsic value | $	$ 11.6
Option shares exercisable, December 31, 2016, Aggregate intrinsic value | $	11.6
Option shares vested and expected to vest, December 31, 2016, Aggregate intrinsic value | $	$ 11.6