Common Stock Plans (Stock Options, Range of Exercise Prices) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	6 years 9 months 7 days
Number of exercisable options, Weighted Average Remaining Contractual Life (in years)	5 years 10 months 20 days
Stock options | Stock Incentive Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices, Lower Range Limit	$ 29.79
Number of outstanding options, Range of Exercise Prices, Upper Range Limit	$ 80.48
Number of outstanding options, Shares	1,191,044
Stock options | Stock Incentive Plan | $46.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 46.45
Number of outstanding options, Shares	59,330
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	3 years
Stock options | Stock Incentive Plan | $60.56
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 60.56
Number of outstanding options, Shares	99,965
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	4 years
Stock options | Stock Incentive Plan | $29.79
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 29.79
Number of outstanding options, Shares	78,222
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	5 years
Stock options | Stock Incentive Plan | $46.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 46.69
Number of outstanding options, Shares	203,469
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	6 years
Stock options | Stock Incentive Plan | $54.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 54.99
Number of outstanding options, Shares	266,166
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	7 years
Stock options | Stock Incentive Plan | $54.11
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 54.11
Number of outstanding options, Shares	349,754
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	8 years
Stock options | Stock Incentive Plan | $48.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 48.36
Number of outstanding options, Shares	130,452
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	9 years
Stock options | Stock Incentive Plan | $80.48
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Range of Exercise Prices	$ 80.48
Number of outstanding options, Shares	3,686
Number of outstanding options, Weighted Average Remaining Contractual Life (in years)	9 years 9 months 29 days