Capital Stock (Stock Repurchases Pursuant To Board Of Director Authorizations) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period, shares	9.0	7.7	6.5
Stock repurchase program remaining authorization	20.9
1997 Authorization [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period, shares	3.2	0	4.3
Stock repurchase program remaining authorization	0
2007 Authorization [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period, shares	5.8	7.7	2.2
Stock repurchase program remaining authorization	0.9
2014 Authorization [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchased during period, shares	0	0	0
Stock repurchase program remaining authorization	20.0