Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Details) - $ / shares shares in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 3 months 18 days	5 years 7 months 6 days
Share Based Compensation Arrangement By Share Based Payment Award Options, Exercisable, Weighted Average Fair Value Grant Date			$ 3.77	$ 3.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 3 months 18 days	5 years 7 months 6 days
Stock option activity, outstanding
Outstanding, beginning balance, shares	0.5
Exercisable, beginning balance, shares	0.5
Granted, shares	0.0
Exercised, shares	(0.1)
Forfeited/cancelled, shares	0.0
Outstanding, ending balance, shares	0.4	0.5
Exercisable, ending balance, shares	0.4	0.5
Exercised, weighted average exercise price	$ 13.76
Outstanding, weighted average exercise price			13.31	13.33
Exercisable, weighted average exercise price			$ 13.31	$ 13.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares	0.5	0.5	0.4	0.5
Outstanding, weighted average exercise price			$ 13.31	$ 13.33
Exercisable, shares	0.5	0.5	0.4	0.5
Exercisable, weighted average exercise price			$ 13.31	$ 13.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 3.77	$ 3.78