Stock-Based Compensation (Calculation And Assumptions Utilized In Calculation Of Fair Values Of Options Granted) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	6 Months Ended
	Jan. 31, 2011	Jun. 30, 2011	Jun. 30, 2010
Number of options foregone for every one RSU offered	4
Options granted		1.0	1.3
Aggregate grant date fair value		$ 4.9	$ 5.1
Weighted-average per share grant date fair value		$ 4.91	$ 4.08
Risk-free interest rate		2.70%	3.10%
Expected life in years		7.1	6.9
Expected volatility (over expected life)		33.30%	33.20%
Expected dividend yield (over expected life)		4.70%	5.20%
Cash payments to employees elected in lieu of options		$ 0.3	$ 0.6
Restricted Stock Units (RSUs) [Member]
RSUs vesting period, years		one-third increments at 12 months, 24 months and 36 months after the date of grant