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Stock-Based Compensation (Stock Appreciation Rights Outstanding and Exercisable) (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years 3 months 18 days |
Stock Appreciation Rights Outstanding, Shares | 679,500,000 | 796,700,000
Stock Appreciation Rights Exercisable, Shares | 458,000,000.0 |
$34.06 to $46.78 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, upper range limit | $ 156.94 |
Stock Appreciation Rights Outstanding, Shares | 200,300,000 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 2 years 4 months 20 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 28.4 |
Stock Appreciation Rights Exercisable, Shares | 200,300,000 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 1 year 3 months 10 days |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 27.0 |
Range of Exercise Prices per Share, lower range limit | $ 99.64 |
$51.11 to $81.14 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, upper range limit | $ 214.63 |
Stock Appreciation Rights Outstanding, Shares | 256,000,000.0 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 4 years 5 months 26 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 16.4 |
Stock Appreciation Rights Exercisable, Shares | 214,000,000.0 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 4 years 4 months 20 days |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 13.9 |
Range of Exercise Prices per Share, lower range limit | $ 205.53 |
$92.64 to $126.31 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, upper range limit | $ 278.00 |
Stock Appreciation Rights Outstanding, Shares | 223,200,000 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 6 years 4 months 28 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 2.2 |
Stock Appreciation Rights Exercisable, Shares | 43,700,000 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 6 years |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 0.7 |
Range of Exercise Prices per Share, lower range limit | $ 257.08 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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