Stock-Based Compensation (Components Of Stock Options) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, Options (in shares) | shares	1.6
Granted, options (in shares) | shares	0.1
Exercised, Options (in shares) | shares	(1.1)
Outstanding at end of period, Options (in shares) | shares	0.6
Vested or expected to vest (in shares) | shares	0.6
Exercisable (vested) at end of period (in shares) | shares	0.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at the beginning of period, Weighted Average Exercise Price per Share (in dollars per share) | $ / shares	$ 25.43
Granted, Weighted Average Exercise Price per Share (in dollars per share) | $ / shares	36.25
Exercised, Weighted Average Exercise Price per Share (in dollars per share) | $ / shares	22.40
Outstanding at end of period, Weighted Average Exercise Price per Share (in dollars per share) | $ / shares	33.03
Vested or expected to vest (in dollars per share) | $ / shares	33.03
Exercisable (vested) at 12/31/2018 (in dollars per share) | $ / shares	$ 32.34
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at end of period, Weighted Average Remaining Contractual Life in Years	4 years 8 months 12 days
Vested or expected to vest at end of period, Weighted Average Remaining Contractual Life in Years	4 years 8 months 12 days
Exercisable (vested) at end of period, Weighted Average Remaining Contractual Life in Years	3 years 9 months 18 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 10.4
Vested or expected to vest at end of period, Aggregate Intrinsic Value | $	10.4
Exercisable (vested) at end of period, Aggregate Intrinsic Value | $	$ 8.9