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Stock-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Compensation expense for stock-based payments and total income tax benefit recognized | Total compensation expense for stock-based payments and total income tax benefit recognized on the consolidated statements of income for stock-based awards at December 31, 2021, 2020 and 2019 were as follows:
(in millions) |  | 2021 |  | 2020 |  | 2019
Compensation expense |  | $ | 76.4 |  |  | $ | 96.9 |  |  | $ | 85.8 |
Income tax benefit recognized |  | 20.6 |  |  | 23.6 |  |  | 27.3 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes stock option activity for 2021. Aggregate intrinsic value is in millions.
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2020 |  | 102,823 |  |  | $ | 54 |  |  | 0.7 |  | $ | 13.1 |
Exercised |  | (101,363) |  |  | 54 |  |  |  |  |
Cancelled |  | (440) |  |  | 54 |  |  |  |  |
Outstanding at December 31, 2021 |  | 1,020 |  |  | 56 |  |  | 0.5 |  | 0.2 |
Exercisable at December 31, 2021 |  | 1,020 |  |  | 56 |  |  | 0.5 |  | 0.2 |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes restricted stock, restricted stock units and performance shares activity for 2021:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020 | 1,264,287 |  |  | $ | 190 |
Granted | 499,632 |  |  | 202 |
Vested | (335,411) |  |  | 167 |
Cancelled | (313,453) |  |  | 180 |
Outstanding at December 31, 2021 | 1,115,055 |  |  | 205 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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