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Stock-Based Compensation Plans (Summary Of Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Outstanding, as of December 31 |  | 522,827 |  |  |
Granted |  | 4,235 |  |  |
Converted |  | (1,439) |  |  |
Forfeited |  | 8,850 |  |  |
Outstanding, as of December 31 |  | 516,773 | [1] | 522,827 |
Vested |  | 308,509 |  |  |
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31 |  | $ 126.59 |  |  |
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Granted |  | 363.11 |  | $ 206.45 | $ 181.04
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Converted |  | 159.08 |  |  |
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Forfeited |  | 206.45 |  |  |
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31 |  | 127.07 |  | $ 126.59 |
Weighted Average Grant-Date Fair Value Per Share, Vested as of December 31 |  | $ 114.92 |  |  |
Aggregate Intrinsic Value, Outstanding | [2] | $ 197.3 |  |  |
Aggregate Intrinsic Value, Vested | [2] | $ 117.8 |  |  |
Weighted Average Remaining Contractual Term, Outstanding |  | 4 years 4 months |  |  |
Weighted Average Remaining Contractual Term, Vested |  | 3 years 5 months |  |  |
[1] | No RSUs outstanding at December 31, 2018 were convertible to shares of common stock.
[2] | The intrinsic value of RSUs is measured by applying the closing stock price as of December 31, 2018 to the applicable number of units.

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested weighted average grant date fair value. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Weighted Average Remaining Contractual Terms + References No definition available. + Details
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- Definition The weighted average fair value of awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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