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Stock-Based Compensation (details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Share Based Compensation Arrangement By Share Based Payment Award Additional General Disclosures Abstract    
Additional Ltip Shares Authorized 250,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 850,000 600,000
Common stock was authorized for grants under the LTIP 35,340  
Weighted-average per share grant date fair value of unvested shares $ 53.92  
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology Abstract    
Fair value pricing model LTIP Monte-Carlo option pricing model  
Stock price on valuation date $ 48.00  
Performance term (in years) 3.0  
Quarterly Dividends Paid Per Share $ 0.445  
Expected dividend yield 3.60%  
Dividend Discount Factor 0.9012  
Stock Issued During Period Sharebased Compensation Abstract    
Shares granted under RSU 21,720  
Stock Price On Restricted Stock Unit Grant Date $ 48  
Unrecognized compensation cost $ 0.70  
Unrecognized compensation cost, period for recognition through 2014