Share-Based Compensation Share-Based Compensation (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2012 Years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2012	5,000	[1]
Stock Options, Outstanding, Weighted Average Exercise Price	$ 25.77
Granted, Stock Options	1,550,000
Stock Options, Grants in Period, Weighted Average Exercise Price	$ 42.61
Exercised, Stock Options	(5,000)
Stock Options, Exercises in Period, Weighted Average Exercise Price	$ 25.77
Forfeited, Stock Options	0
Stock Options, Forfeitures in Period, Weighted Average Exercise Price	$ 0.00
Outstanding at March 31, 2012	1,550,000	[2],[3]
Stock Options, Outstanding, Weighted Average Exercise Price	$ 42.61
Remaining Contractual Term (years)	9.9
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Fair value of options granted per share	$ 9.20
Expected stock price volatility	33.00%
Risk-free interest rate	1.35%
Dividend yield	3.80%
Expected life of option (in years)	6.5

[1] Stock options outstanding as of December 31, 2011 were granted in 2002 and exercised in 2012 prior to expiration. No stock options were granted during 2003 through 2011.

[2] The total intrinsic value of options outstanding at March 31, 2012 was $6.2 million.

[3] As of March 31, 2012, none of the outstanding stock options were exercisable.