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Equity Based Compensation (Narrative Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Equity Based Compensation [Abstract]
Allocated Share Based Compensation Expense	$ 9,700,000	$ 8,400,000
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross	700,000
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price	$ 58.77
Performance Contingent Units	300,000
Shares Granted To Non Employee Directors	14,200
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number	2,100,000
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price	$ 49.29
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term	5.1
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized	$ 44,600,000
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition	3.1

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Performance contingent units issued to employees during the period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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