Share Based Compensation (Details 1) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Data With Respect to Stock Options/SARs Activity
Outstanding Number of Option at beginning of the year	1,879
Number of Options, Granted	350
Number of Options, Exercised	(341)
Number of Options, Forfeited/Cancelled	(10)
Number of Options, Expired	(6)
Outstanding Number of Options at end of the year	1,872
Number of Options Vested and exercisable at end of the year	1,146
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding Weighted Average Exercise Price at beginning of the year	$ 31.08
Weighted Average Exercise Price, Granted	$ 43.99
Weighted Average Price, Exercised	$ 28.99
Weighted Average Price, Forfeited/Cancelled	$ 37.15
Weighted Average Price, Expired	$ 38.95
Outstanding Weighted Average Exercise Price at end of the year	$ 33.82
Weighted Average Price, Vested and exercisable at end of the year	$ 31.48
Outstanding, Weighted Average Remaining Contractual Term at end of the year	3 years 8 months 12 days
Weighted Average Remaining Contractual Term of Option Vested and exercisable at end of the year	2 years 7 months 6 days
Total intrinsic value of options/SARs exercised	$ 4.9
Total Intrinsic Value of Outstanding Option at end of the year	18.0
Total Intrinsic Value of Option, Vested and exercisable at end of the year	$ 13.8