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Share-Based Compensation (Summary Of Share Options Outstanding And Exercisable) (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 $30.06-$41.16 [Member] | Mar. 31, 2012 $42.90-$45.53 [Member] | Mar. 31, 2012 $48.02-$73.32 [Member]
Range of exercise prices, minimum |  |  |  | $ 30.06 |  | $ 42.90 |  | $ 48.02 |
Range of exercise prices, maximum |  |  |  | $ 41.16 |  | $ 45.53 |  | $ 73.32 |
Outstanding Options, Number | 1,129,156 | [1] | 1,339,536 | 414,656 | [1] | 466,060 | [1] | 248,440 | [1]
Outstanding Options, Weighted Average Price | $ 41.61 | [1] | $ 42.27 | $ 32.06 | [1] | $ 44.32 | [1] | $ 52.43 | [1]
Exercisable Options, Number | 841,612 | [1] |  | 218,853 | [1] | 447,429 | [1] | 175,330 | [1]
Exercisable Options, Weighted Average Price | $ 43.68 | [1] |  | $ 33.86 | [1] | $ 44.34 | [1] | $ 54.27 | [1]
Aggregate intrinsic value of outstanding options | $ 27.4 |  |  |  |  |  |  |  |
Aggregate Intrinsic Value of Exercisable Options | $ 18.7 |  |  |  |  |  |  |  |
Closing share price per share for calculation of aggregate intrinsic values | $ 65.75 |  |  |  |  |  |  |  |
[1] | The aggregate intrinsic value of outstanding and exercisable options at March 31, 2012 were $27.4 million and $18.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $65.75 per share on March 31, 2012 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 The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + 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 total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a, b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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