Shareholders' Equity (Schedule Of Common Stock Outstanding Roll Forward) (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued at beginning of year	103,477,452us-gaap_CommonStockSharesIssued	109,109,604us-gaap_CommonStockSharesIssued
Shares cancelled, shares	(2,702,196)us-gaap_TreasuryStockSharesRetired	(5,632,152)us-gaap_TreasuryStockSharesRetired
Shares issued at end of year	100,775,256us-gaap_CommonStockSharesIssued	103,477,452us-gaap_CommonStockSharesIssued	109,109,604us-gaap_CommonStockSharesIssued
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury shares issued at beginning of year	3,223,806us-gaap_TreasuryStockShares	4,716,261us-gaap_TreasuryStockShares
Shares repurchased, shares	4,906,785us-gaap_TreasuryStockSharesAcquired	5,544,432us-gaap_TreasuryStockSharesAcquired	10,967,877us-gaap_TreasuryStockSharesAcquired
Shares issued out of treasury	(848,621)	(1,404,735)
Shares cancelled, shares	(2,702,196)us-gaap_TreasuryStockSharesRetired	(5,632,152)us-gaap_TreasuryStockSharesRetired
Total treasury shares at end of year	4,579,774us-gaap_TreasuryStockShares	3,223,806us-gaap_TreasuryStockShares	4,716,261us-gaap_TreasuryStockShares
Total shares outstanding at end of year	96,195,482us-gaap_CommonStockSharesOutstanding	100,253,646us-gaap_CommonStockSharesOutstanding

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Number of shares of common and preferred stock retired from treasury during the period.

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