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Share-Based Compensation and Benefit Plans (Summary Of Share Options Outstanding And Exercisable) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |
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Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Outstanding Options, Number | 68,978 | [1] |  | 105,066 | 295,205 | 321,811
Outstanding Options, Weighted Average Price | $ 61.15 |  |  | $ 48.27 | $ 42.49 | $ 38.97
Aggregate intrinsic value of outstanding options | $ 2.1 |  |  |  |  |
Aggregate Intrinsic Value of Exercisable Options | $ 2.1 |  |  |  |  |
Share Price | $ 92.06 |  | $ 85.51 |  |  |
Exercise Price Thirty Point Zero Six Member [Domain] |  |  |  |  |  |
Range of exercise prices, minimum | 30.06 |  |  |  |  |
Range of exercise prices, maximum | $ 30.06 |  |  |  |  |
Exercisable Options, Number | 26,114 |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 30.06 |  |  |  |  |
Range Of Exercise Prices Forty One Point One Six To Forty Three Point Nine Four [Domain] |  |  |  |  |  |
Range of exercise prices, minimum | 75.17 |  |  |  |  |
Range of exercise prices, maximum | $ 75.17 |  |  |  |  |
Exercisable Options, Number | 15,388 |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 75.17 |  |  |  |  |
Range Of Exercise Prices Forty Eight Point Zero Two To Seventy five Point Seventeen Member [Domain] |  |  |  |  |  |
Range of exercise prices, minimum | 80.89 |  |  |  |  |
Range of exercise prices, maximum | $ 85.05 |  |  |  |  |
Exercisable Options, Number | 27,476 |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 82.84 |  |  |  |  |
[1] | The aggregate intrinsic value of options outstanding and exercisable at December 31, 2017 was approximately $2.1 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $92.06 per share on December 31, 2017 and the strike price of the underlying award.

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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=96867065&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=96867065&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=96867065&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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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