Share-Based Plans (Options Outstanding and Options Exercisable) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares | shares	1,527,074
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	4 years
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 23.92
Options Exercisable, Number of Shares | shares	1,420,758
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	3 years 9 months 18 days
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 23.99
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	5.14
Upper Range Limit (in dollars per share)	$ 20.00
Options Outstanding, Number of Shares | shares	448,941
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	3 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 9.67
Options Exercisable, Number of Shares | shares	448,941
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	3 years 2 months 12 days
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 9.67
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	20.01
Upper Range Limit (in dollars per share)	$ 30.00
Options Outstanding, Number of Shares | shares	672,339
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	6 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 23.54
Options Exercisable, Number of Shares | shares	566,023
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	5 years 10 months 24 days
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 23.65
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	30.01
Upper Range Limit (in dollars per share)	$ 40.00
Options Outstanding, Number of Shares | shares	192,518
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	2 years
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 32.03
Options Exercisable, Number of Shares | shares	192,518
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	2 years
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 32.03
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Range Limit (in dollars per share)	40.01
Upper Range Limit (in dollars per share)	$ 48.88
Options Outstanding, Number of Shares | shares	213,276
Options Outstanding, Weighted-Average Remaining Contractual Life (years)	1 year
Options Outstanding, Weighted-Average Exercise Price (in dollars per share)	$ 47.77
Options Exercisable, Number of Shares | shares	213,276
Options Exercisable, Weighted-Average Remaining Contractual Life (years)	1 year
Options Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 47.77