Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended							0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Mar. 26, 2012 Restricted Stock [Member] Chief Executive Officer [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Mar. 26, 2012 Restricted Stock Units (RSUs) [Member] Chief Executive Officer [Member]	Dec. 31, 2013 Ten Year Vesting [Member]	Mar. 26, 2012 Ten Year Vesting [Member] Restricted Stock [Member]	Mar. 26, 2012 Ten Year Vesting [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Five Year Vesting [Member]	Mar. 26, 2012 Five Year Vesting [Member] Restricted Stock [Member]	Dec. 31, 2013 Maximum [Member] Restricted Stock [Member]	Dec. 31, 2013 Minimum [Member] Restricted Stock [Member]	Mar. 26, 2012 Incentive Plan [Member]	Dec. 31, 2013 Incentive Plan [Member]	Dec. 31, 2013 1992 Plan [Member]	Dec. 31, 2012 1992 Plan [Member]	Dec. 31, 2011 1992 Plan [Member]	Dec. 31, 2013 Director Plan [Member]	Dec. 31, 2012 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total authorized shares for plan issuance																				2,000,000		8,000,000			200,000
Number of additional shares authorized for issuance																				500,000
Shares available for issuance																					314,777
Awards granted					9,119			190,000				310,000		90,000	310,000		100,000
Vesting period													10 years			5 years		5 years	3 years
Weighted average fair value of shares granted					$ 113.56	$ 105.96	$ 70.40		$ 122.81	$ 105.74	$ 63.73
Fair value of shares vested					$ 1.9	$ 3.6	$ 4.4
Restricted stock units converted to common stock									848	0	0
Options expiration period				10 years
Number of options outstanding																						0	0	0	35,000	70,000
Intrinsic value of restricted stock units exercised									0.1
Intrinsic value of stock options exercised	$ 3.2	$ 3.0	$ 15.8
Weighted average recognition period	3 years 7 months 6 days