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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation Expense |
| Year Ended December 31,
(in millions) | 2023 | 2022 | 2021
Restricted stock unit awards | $ | 65.9 |  | 48.5 |  | 37.7 |
Performance stock unit awards | 9.0 |  | 26.8 |  | 42.4 |
Total | $ | 74.9 |  | 75.3 |  | 80.1 |
Restricted Stock Unit Activity |
| RSU Shares (in 000's) | PSU Shares (in 000's) |  | Total Shares (in 000's) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2020 | 1,096.2 |  | 531.5 |  |  | 1,627.7 |  |  | $ | 137.42 |  | 1.69
Granted | 335.7 |  | 218.9 |  |  | 554.6 |  |  | 189.40 |  |
Vested | (471.1) |  | (79.0) |  |  | (550.1) |  |  | 145.54 |  |
Forfeited | (48.4) |  | (25.4) |  |  | (73.8) |  |  | 148.97 |  |
Unvested as of December 31, 2021 | 912.4 |  | 646.0 |  |  | 1,558.4 |  |  | 152.27 |  | 1.99
Granted | 353.2 |  | 116.5 |  |  | 469.7 |  |  | 204.05 |  |
Vested | (395.7) |  | (175.1) |  |  | (570.8) |  |  | 147.78 |  |
Forfeited | (28.6) |  | (20.4) |  |  | (49.0) |  |  | 168.92 |  |
Unvested as of December 31, 2022 | 841.3 |  | 567.0 |  |  | 1,408.3 |  |  | 170.78 |  | 1.79
Granted | 520.5 |  | 185.2 |  |  | 705.7 |  |  | 143.64 |  |
Vested | (296.8) |  | (257.2) |  |  | (554.0) |  |  | 126.28 |  |
Forfeited | (74.9) |  | (36.9) |  |  | (111.8) |  |  | 164.42 |  |
Unvested as of December 31, 2023 | 990.1 |  | 458.1 |  |  | 1,448.2 |  |  | $ | 175.07 |  | 1.66

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- Definition Schedule of Share-based Compensation, Restricted and Performance Stock Units Award Activity [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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