Incentive Plans (Narrative) (Details) (USD $)	9 Months Ended			0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended				9 Months Ended	0 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Feb. 04, 2014 Stock Options [Member]	Sep. 30, 2014 Stock Options [Member]	Feb. 04, 2014 Performance-Based Restricted Stock Units [Member]	Sep. 30, 2014 Performance-Based Restricted Stock Units [Member]	Feb. 04, 2014 Performance-Based Restricted Stock Units [Member] Minimum [Member]	Feb. 04, 2014 Performance-Based Restricted Stock Units [Member] Maximum [Member]	Feb. 04, 2014 Time Based Restricted Stock Units (RSU) [Member]	Feb. 05, 2014 Time Based Restricted Stock Units (RSU) [Member] Non-employee Director Plan [Member]	Sep. 30, 2014 Time Based Restricted Stock Units (RSU) [Member] Non-employee Director Plan [Member]	Feb. 04, 2014 SAR [Member]	Feb. 04, 2014 Cash-Settled RSU (RSU-C) [Member]	Sep. 30, 2014 2012 Long-Term Plan [Member]	Sep. 30, 2014 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long term plan expiration year															2022
Maximum number of shares available for issuance															8,700,000	980,000
Maximum number of shares available for issuance, annual rate															1.00%
Granted stock options				772,900									183,200
Granted stock options, exercise price				$ 55.82
Stock-based compensation, fair value assumption model					Black-Scholes valuation model		Monte Carlo valuation model
Granted stock options, valuation per option				$ 12.84
Granted restricted stock						464,300				233,400	43,848			170,900
Granted restricted stock, fair value								$ 33.90	$ 51.30	$ 55.82	$ 55.20
Granted restricted stock, vesting scheme												These shares vest on the third anniversary of the date of grant.
Proceeds from exercise of stock options and employee stock purchase plans		$ 2,778,000	[1]
Income tax benefits realized for the tax deductions from option exercises	$ 3,800,000	$ 6,300,000

[1] Reclassified to conform to current presentation - See Note D.