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Stock-based Compensation (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Schedule of information on stock units  
Undistributed, Beginning Balance 0.9
Undistributed, Weighted-Average Grant Date Fair Value per Share, Beginning Balance $ 33.40
Granted 0.1
Granted, Weighted-Average Grant Date Fair Value per Share $ 48.64
Additional shares earned (0.1)
Additional shares earned, Weighted-Average Grant Date Fair Value per Share $ 26.58
Distributed (0.1)
Distributed, Weighted-Average Grant Date Fair Value per Share $ 25.73
Forfeited (0.1)
Forfeited, Weighted-Average Grant Date Fair Value per Share $ 35.96
Undistributed, Ending Balance 0.7 [1]
Undistributed, Weighted-Average Grant Date Fair Value per Share, Ending Balance $ 39.06 [1]
[1] Undistributed performance share units include approximately 0.5 million units with a weighted-average grant date fair value of $40.31 per share that had not yet vested and 0.2 million units that have vested but were not yet distributed.