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Stock-Based Compensation Plans (Details 3) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Schedule of information on stock units  
Undistributed, Beginning Balance 0.8
Undistributed, Weighted-Average Grant Date Fair Value per Share, Beginning Balance $ 33.90
Granted 0.3
Granted, Weighted-Average Exercise Price per Share $ 31.78
Additional shares earned (0.2)
Additional shares earned, Weighted-Average Grant Date Fair Value per Share $ 32.92
Distributed 0
Distributed, Weighted-Average Grant Date Fair Value per Share $ 0.00
Forfeited 0
Forfeited, Weighted-Average Grant Date Fair Value per Share $ 35.45
Undistributed, Ending Balance 0.9
Undistributed, Weighted-Average Grant Date Fair Value per Share, Ending Balance $ 33.40