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Stock-Based Compensation Plans Stock-Based Compensation Plans (Schedule Of Future Share-Based Compensation Cost) - Equity Option [Member] $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
2021	$ 33.6
2022	36.9
2023	36.3
2024	36.3
2025	2.2
Total	$ 145.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 346.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares	770,500

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- Definition

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Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Three Years

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Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs In Two Years

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Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs Next Twelve Months

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Employee Service Share Based Compensation Estimated Allocation Of Recognized Period Costs Total

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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