Stock-Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Compensation, by Type of Award [Line Items]
Shares remaining under the 2011 Omnibus Incentive Compensation Plan (in shares)	4,718,287
Reduction in the number of shares available for grant	Stock options and stock appreciation rights reduce the number of shares available for grant by one share for each award granted. All other awards that will be distributed in stock under the 2011 Plan will reduce the total number of shares available for grant by an amount equal to 2.35 times the number of shares awarded.
Stock-based compensation expense	$ 8,400,000	$ 7,800,000	$ 7,500,000
Unrecognized compensation expense for all nonvested awards	10,800,000
Weighted-average period to recognize unrecognized compensation expenses (in years)	1.6
Weighted Average Grant Date Fair Value [Abstract]
PVS payout, Minimum (in hundredths)	0.00%
PVS payout, Maximum (in hundredths)	200.00%
ESPP Shares available for issuance (in shares)	4,718,287
Deferred Compensation Plan [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Deferred stock units (in shares)	180,373
Deferred stock awards (in shares)	85,782
Stock-based compensation expense	400,000	1,300,000	1,500,000
Stock options [Roll Forward]
Outstanding, ending balance (in shares)	180,373
Outstanding Awards [Roll Forward]
Outstanding, ending balance (in shares)	85,782
PVS awards [Roll forward]
Outstanding, ending balance (in shares)	85,782
Employee Stock Purchase Plan [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Shares remaining under the 2011 Omnibus Incentive Compensation Plan (in shares)	2,200,000
Stock-based compensation expense	300,000	300,000	300,000
Weighted Average Grant Date Fair Value [Abstract]
Common stock sales price percentage offered to eligible employees (in hundredths)	85.00%
ESPP base salary, maximum (in hundredths)	25.00%
ESPP salary deduction, annual maximum	25,000
Shares employee may buy, offering period maximum (in shares)	1,000
Shares employee may buy, annual maximum (in shares)	4,000
ESPP shares purchased (in shares)	55,388	56,608	58,606
ESPP Shares available for issuance (in shares)	2,200,000
Management Incentive Plan [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Ratio of restricted incentive stock award, description	given a restricted incentive stock award equal to one share for each four bonus shares issued
Incentive stock award grants (in shares)	1,900	1,400	3,700
Granted, PVS awards (in shares)	1,900	1,400	3,700
Incentive stock award forfeited (in shares)	1,400	50	400
Weighted average grant-date fair value, PVS awards (per share)	$ 40.85	$ 38.22	$ 32.09
Outstanding Awards [Roll Forward]
Granted (in shares)	1,900	1,400	3,700
Forfeited (in shares)	(1,400)	(50)	(400)
PVS awards [Roll forward]
Granted (in shares)	1,900	1,400	3,700
Forfeited (in shares)	(1,400)	(50)	(400)
Weighted Average Grant Date Fair Value [Abstract]
Granted at target level (in dollars per share)	$ 40.85	$ 38.22	$ 32.09
Stock Options [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Deferred stock units (in shares)	2,900,000	2,900,000	2,700,000
Vesting period (in years)	4
Weighted average grant date fair value, options (per share)	$ 8.76	$ 10.38	$ 6.98
Intrinsic value of options exercised	10,700,000	5,900,000	7,100,000
Grant date fair value of options vested	4,000,000	3,500,000	3,700,000
Expiration period (in years)	10
Stock options [Roll Forward]
Outstanding, beginning balance (in shares)	2,900,000	2,700,000	2,600,000
Granted (in shares)	500,000	600,000	400,000
Exercised (in shares)	400,000	300,000	300,000
Forfeited (in shares)	100,000	100,000
Outstanding, ending balance (in shares)	2,900,000	2,900,000	2,700,000
Options exercisable, period end (in shares)	1,800,000	1,800,000	1,700,000
Weighted Average Exercise Price [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 32.32	$ 29.09	$ 26.91
Granted (in dollars per share)	$ 40.85	$ 42.47	$ 32.12
Exercised (in dollars per share)	$ 17.69	$ 14.88	$ 13.70
Forfeited (in dollars per share)	$ 41.40	$ 41.47	$ 37.43
Outstanding, ending balance (in dollars per share)	$ 35.79	$ 32.32	$ 29.09
Exercisable, period end (in dollars per share)	$ 32.91	$ 27.77	$ 24.52
Weighted average remaining contractual life {Abstract]
Options outstanding (in years)	6.1
Options exercisable (in years)	4.7
Aggregate intrinsic value [Abstract]
Options outstanding	13,600,000
Vested options	12,600,000
Assumptions used in Black-Scholes model [Abstract]
Risk-free interest rate (in hundredths)	2.20%	2.40%	1.90%
Expected life (in years)	5	5	5
Stock volatility	24.30%	26.90%	27.00%
Dividend yield	1.70%	1.50%	1.90%
Vesting period (in years)	4
Performance-Vesting Share (PVS) Awards [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Deferred stock awards (in shares)	328,519	347,550	327,498
Incentive stock award grants (in shares)	101,099	123,068	125,600
Stock-based compensation expense	3,000,000	2,200,000	1,800,000
PVS expense recorded within restructuring and other	700,000
Granted, PVS awards (in shares)	101,099	123,068	125,600
Incentive stock award forfeited (in shares)	(10,199)	(4,315)	(43,365)
Weighted average grant-date fair value, PVS awards (per share)	$ 40.85	$ 42.34	$ 32.12
Outstanding Awards [Roll Forward]
Outstanding, beginning balance (in shares)	347,550	327,498	330,458
Granted (in shares)	101,099	123,068	125,600
Forfeited (in shares)	10,199	4,315	43,365
Outstanding, ending balance (in shares)	328,519	347,550	327,498
PVS awards [Roll forward]
Outstanding, beginning balance (in shares)	347,550	327,498	330,458
Granted (in shares)	101,099	123,068	125,600
Adjustments above/(below) target (in shares)	(58,175)	(48,364)	(5,112)
Vested and converted (in shares)	51,756	50,337	80,083
Forfeited (in shares)	10,199	4,315	43,365
Outstanding, ending balance (in shares)	328,519	347,550	327,498
Weighted Average Grant Date Fair Value [Abstract]
Non-vested awards, beginning balance (in dollars per share)	$ 39.21	$ 39.63	$ 40.62
Granted at target level (in dollars per share)	$ 40.85	$ 42.34	$ 32.12
Adjustments above/(below) target (in dollars per share)	$ 41.95	$ 44.99	$ 32.69
Vested and converted (in dollars per share)	$ 40.85	$ 38.22	$ 32.69
Forfeited (in dollars per share)	$ 38.46	$ 37.61	$ 39.10
Non-vested awards, ending period (in dollars per share)	$ 38.77	$ 39.21	$ 39.63
Expected conversion of PVS awards (in shares)	209,848
Expected percentage of awards that will vest at their target amounts (in hundredths)	60.00%
Average remaining term of converted PVS awards (in years)	1.4
Stock Appreciation Rights (SARs) [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Deferred stock awards (in shares)	162,106	111,048	78,512
Incentive stock award grants (in shares)	63,024	36,255	22,500
Vesting period (in years)	4
Granted, PVS awards (in shares)	63,024	36,255	22,500
Incentive stock award forfeited (in shares)	(4,281)
Expiration period (in years)	ten years
Assumptions used in Black-Scholes model [Abstract]
Vesting period (in years)	4
Outstanding Awards [Roll Forward]
Outstanding, beginning balance (in shares)	111,048	78,512	56,012
Granted (in shares)	63,024	36,255	22,500
Exercised (in shares)	7,685	3,719
Forfeited (in shares)	4,281
Outstanding, ending balance (in shares)	162,106	111,048	78,512
Exercisable, period end (in shares)	58,900	41,439	24,861
Weighted Average Exercise Price, Awards Other than Options [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 39.74	$ 38.04	$ 40.43
Granted (in dollars per share)	$ 41.13	$ 42.68	$ 32.09
Exercised (in dollars per share)	$ 39.15	$ 32.50
Forfeited (in dollars per share)	$ 40.85
Outstanding, ending balance (in dollars per share)	$ 40.28	$ 39.74	$ 38.04
Exercisable, period end (in dollars per share)	$ 39.72	$ 39.16	$ 39.22
PVS awards [Roll forward]
Outstanding, beginning balance (in shares)	111,048	78,512	56,012
Granted (in shares)	63,024	36,255	22,500
Forfeited (in shares)	4,281
Outstanding, ending balance (in shares)	162,106	111,048	78,512
Performance Vesting Units Awards (PVU) [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Deferred stock awards (in shares)	27,286	23,420	20,792
Incentive stock award grants (in shares)	13,442	7,697	7,200
Stock-based compensation expense	200,000	100,000
Granted, PVS awards (in shares)	13,442	7,697	7,200
Incentive stock award forfeited (in shares)	(1,718)
Weighted average grant-date fair value, PVS awards (per share)	$ 41.11	$ 42.30	$ 32.09
Outstanding Awards [Roll Forward]
Outstanding, beginning balance (in shares)	23,420	20,792	19,346
Granted (in shares)	13,442	7,697	7,200
Forfeited (in shares)	1,718
Outstanding, ending balance (in shares)	27,286	23,420	20,792
PVS awards [Roll forward]
Outstanding, beginning balance (in shares)	23,420	20,792	19,346
Granted (in shares)	13,442	7,697	7,200
Adjustments above/(below) target (in shares)	(4,165)	(2,484)	(345)
Vested and converted (in shares)	3,963	2,585	5,409
Forfeited (in shares)	1,718
Outstanding, ending balance (in shares)	27,286	23,420	20,792
Weighted Average Grant Date Fair Value [Abstract]
Non-vested awards, beginning balance (in dollars per share)	$ 38.94	$ 39.17	$ 39.85
Granted at target level (in dollars per share)	$ 41.11	$ 42.30	$ 32.09
Adjustments above/(below) target (in dollars per share)	$ 41.05	$ 38.22	$ 32.59
Vested and converted (in dollars per share)	$ 40.85	$ 38.22	$ 32.59
Forfeited (in dollars per share)	$ 37.55
Non-vested awards, ending period (in dollars per share)	$ 39.30	$ 38.94	$ 39.17
Performance Vesting Shares/ Unit Dividend Equivalent [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Stock-based compensation expense	100,000	200,000	200,000
Stock Options and Appreciation Rights [Member]
Stock-Based Compensation, by Type of Award [Line Items]
Stock-based compensation expense	4,400,000	3,700,000	3,700,000
Stock option expense recorded within restructuring and other	$ 800,000