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Share-Based Payments - Table 2 (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Y
Summary of stock option activity and related information  
Outstanding, December 31, 2012, Shares 2,575
Outstanding, December 31, 2012, Weighted-Average Exercise Price Per Share $ 21.12
Granted, Shares 141
Granted, Weighted-Average Exercise Price Per Share $ 24.17
Exercised, Shares (338)
Exercised, Weighted-Average Exercise Price Per Share $ 24.39
Forfeitures, Shares 0
Forfeiture, Weighted Average Exercise price Per Share $ 0.00
Expirations, Shares (17)
Expirations, Weighted-Average Exercise Price Per Share $ 24.47
Outstanding, December 31, 2013, Shares 2,361
Outstanding, December 31, 2013, Weighted-Average Exercise Price Per Share $ 20.82
Outstanding, December 31, 2013, Remaining Life 4 years 6 months
Outstanding, December 31, 2013, Aggregate Intrinsic Value $ 29.5
Exercisable, December 31, 2013, Shares 1,991
Exercisable, December 31, 2013, Weighted-Average Exercise Price Per Share $ 20.45
Exercisable, December 31, 2013, Remaining Life 3.8
Exercisable, December 31, 2013, Aggregate Intrinsic Value $ 25.6