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Share-Based Compensation and Non-Qualified Deferred Compensation Plan (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 9 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 $30.06-$41.16 [Member] | Sep. 30, 2013 $42.90-$43.94 [Member] | Sep. 30, 2013 $45.53-$62.32 [Member]
Range of exercise prices, minimum |  |  |  | $ 30.06 |  | $ 42.90 |  | $ 45.53 |
Range of exercise prices, maximum |  |  |  | $ 41.16 |  | $ 43.94 |  | $ 62.32 |
Outstanding Options, Number | 635,568 | [1] | 838,754 | 228,012 | [1] | 108,947 | [1] | 298,609 | [1]
Outstanding Options, Weighted Average Price | $ 41.60 | [1] | $ 42.36 | $ 33.14 | [1] | $ 43.43 | [1] | $ 47.39 | [1]
Exercisable Options, Number | 537,663 | [1] |  | 130,107 | [1] | 108,947 | [1] | 298,609 | [1]
Exercisable Options, Weighted Average Price | $ 43.70 | [1] |  | $ 35.46 | [1] | $ 43.43 | [1] | $ 47.39 | [1]
Aggregate intrinsic value of outstanding options | $ 12.6 |  |  |  |  |  |  |  |
Aggregate Intrinsic Value of Exercisable Options | $ 9.6 |  |  |  |  |  |  |  |
Closing share price per share for calculation of aggregate intrinsic values | $ 61.44 |  |  |  |  |  |  |  |
[1] | The aggregate intrinsic value of outstanding and exercisable options at September 30, 2013 was $12.6 million and $9.6 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $61.44 per share on September 30, 2013 and the strike price of the underlying award.

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- Definition Share Based Compensation Shares Authorized Under Stock Options Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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