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Equity Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Equity Based Compensation [Abstract]
Equity compensation expense	$ 6.0	$ 5.5
Stock appreciation rights granted	700,000
Stock appreciation rights granted, weighted average exercise price (per share)	$ 58.77
Performance contingent units	300,000
Shares Granted To Non Employee Directors	14,200
Options exercisable (shares)	1,800,000
Options exercisable, weighted average price (per share)	$ 50.43
Options, remaining term	5 years 1 month 6 days
Compensation cost not yet recognized	$ 38.2
Period for recognition	2 years 2 months 12 days

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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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross number of share options (or share units) granted during the period.

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