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Stock-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended1 Months Ended0 Months Ended
Jan. 14, 2011
Stock Incentive Plan [Member]
Jan. 31, 2011
Stock Incentive Plan [Member]
Feb. 18, 2011
Restricted Stock [Member]
Feb. 18, 2011
Stock Options [Member]
Feb. 18, 2011
LTIP Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]     
Target stock price $ 62.00   
Stock authorized for stock based compensation41,100    
Shares from a discretionary pool7,350    
Stock based compensation expense$ 3.0 $ 2.3$ 9.8$ 2.7
Restricted stock shares authorized    42,000
Shares approved to grant  35,713513,100 
Shares vesting period, years  434