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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant (in shares) | 53.9 |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 2 years |  |
Weighted average grant date fair value (in dollars per share) | $ 137.33 | $ 112.09 | $ 71.63
Shares issued in period (in shares) | 1.1 | 1.2 | 0.9
Shares expected to be issued (in shares) | 0.8 |  |
Total compensation cost not yet recognized | $ 77.3 |  |
Period for recognition of the compensation cost not yet recognized | 12 months |  |
Shareholder Value Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Weighted average grant date fair value (in dollars per share) | $ 139.14 | $ 95.01 | $ 48.51
Shares issued in period (in shares) | 0.8 | 1.0 | 0.7
Shares expected to be issued (in shares) | 1.0 |  |
Total compensation cost not yet recognized | $ 48.8 |  |
Period for recognition of the compensation cost not yet recognized | 20 months |  |
Relative Value Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Weighted average grant date fair value (in dollars per share) | $ 179.90 |  |
Total compensation cost not yet recognized | $ 13.7 |  |
Period for recognition of the compensation cost not yet recognized | 24 months |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Weighted average grant date fair value (in dollars per share) | $ 135.42 | $ 108.43 | $ 70.95
Shares issued in period (in shares) | 0.6 | 0.8 | 1.0
Shares expected to be issued (in shares) | 0.6 |  |
Total compensation cost not yet recognized | $ 179.2 |  |
Period for recognition of the compensation cost not yet recognized | 31 months |  |
Grants in period (in shares) | 1.1 | 1.5 | 1.3

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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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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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