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Stock-Based Compensation (Changes in Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ | $ 9.2
Shares |
Outstanding awards as of beginning of period (in shares) | shares | 796,700,000
Granted (in shares) | shares | 92,400,000
Exercised (in shares) | shares | (191,000,000.0)
Outstanding awards as of end of period (in shares) | shares | 679,500,000
Exercisable at end of period (in shares) | shares | 458,000,000.0
Weighted-Average Exercise Price per Share |
Outstanding awards as of beginning of period (in usd per share) | $ / shares | $ 181.15
Granted (in usd per share) | $ / shares | 278.00
Exercised (in usd per share) | $ / shares | 130.35
Outstanding as of end of period (in shares) | $ / shares | 205.41
Exercisable at end of period, Weighted-Average Exercise Price per Share (in usd per share) | $ / shares | $ 182.99
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares | (18,600,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares | $ 225.82

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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