Stock-Based Compensation (Textuals) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant/issuance	3,771,649
Stock compensation expense	$ 15,500,000	$ 8,400,000	$ 7,800,000
Unrecognized compensation expense for all nonveste awards	13,700,000
Weighted average period the amount of unrecognized compensation expense is expected to be recognized	1 year 6 months 30 days
Weighted average remaining contractual life of options outstanding	6 years 6 months 0 days
Weighted average remaining contratual life of options exercisable	5 years 0 months 0 days
Aggregate intrinsic value of total options outstanding	41,700,000
Aggregate intrinsic value of total options vested	24,800,000
Weighted average grant date fair value of options granted	$ 8.02	$ 8.76	$ 10.38
Intrinsic value of options exercised	16,900,000	10,700,000	5,900,000
Grant date fair value of options vested	3,800,000	4,000,000	3,500,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reduced for each award granted	1
Vesting period	4 years
Awards, expiration period	10 years
Risk-free interest rate	0.90%	2.20%	2.40%
Stock volatility	23.30%	24.30%	26.90%
Dividend yield	1.70%	1.70%	1.50%
Expected life	6 years	6 years	6 years
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reduced for each award granted	1
Vesting period	4 years
Awards, expiration period	10 years
Award Types Other than Stock Options and Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reduced for each award granted	2.35
Performance-Vesting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	6,000,000	3,000,000	2,200,000
Weighted average grant date fair value, granted in period	$ 42.66	$ 40.85	$ 42.34
Awards vesting percentage	102.40%
Number of shares to be issued upon conversion	337,062
Average remaining term of shares issued at conversion	1 year 0 months 0 days
Grants	104,840	101,099	123,068
Forfeitures	5,021	10,199	4,315
Employee Stock Purchase Plan (ESPP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant/issuance	2,100,000
Stock compensation expense	400,000	300,000	300,000
Percentage of current market price for sales to eligible employees	85.00%
Limitation on payroll deductions of employee's base salary, percent	25.00%
Limitation on payroll deductions of employee's base salary, amount	25,000
Maximum number of shares per employee	1,000
Maximum number of shares per employee, per year	4,000
Purchases of shares	51,505	55,388	56,608
Annual Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Weighted average grant date fair value, granted in period	$ 42.44	$ 40.85	$ 38.22
Award granted for every bonus shares issued	0.25
Grants	1,400	1,900	1,400
Forfeitures	400	1,400	50
Performance-Vesting Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	900,000	200,000	100,000
Weighted average grant date fair value, granted in period	$ 42.44	$ 41.11	$ 42.30
Grants	13,550	13,442	7,697
Forfeitures	0	1,718	0
President and Chief Operating Officer [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		800,000
President and Chief Operating Officer [Member] | Performance-Vesting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ 700,000
Minimum [Member] | Performance-Vesting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout range	0.00%
Minimum [Member] | Performance-Vesting Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout range	0.00%
Maximum [Member] | Performance-Vesting Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout range	200.00%
Maximum [Member] | Performance-Vesting Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout range	200.00%
Deferred Compensation Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of deferred compensation plans	2
Number of deferred stock units	157,271
Deferred Compensation Plans [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of deferred stock units	97,554