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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Share-Based Compensation Expense | Stock-based compensation expense by award type is presented below.
| Year Ended December 31,
(in millions) | 2021 | 2020 | 2019
Restricted stock unit awards | $ | 37.7 |  | 41.8 |  | 61.6 |
Performance stock unit awards | 42.4 |  | 5.5 |  | 13.6 |
SAYE | — |  | 0.2 |  | 1.2 |
Total | $ | 80.1 |  | 47.5 |  | 76.4 |
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, 2018 | 559.6 |  | 93.1 |  |  | 652.7 |  |  | $ | 131.32 |  | 2.02
Granted | 1,298.0 |  | 196.5 |  |  | 1,494.5 |  |  | 141.06 |  |
Vested | (287.7) |  | — |  |  | (287.7) |  |  | 116.32 |  |
Forfeited | (37.6) |  | (2.8) |  |  | (40.4) |  |  | 137.49 |  |
Unvested as of December 31, 2019 | 1,532.3 |  | 286.8 |  |  | 1,819.1 |  |  | 141.51 |  | 2.39
Granted | 173.1 |  | 276.4 |  |  | 449.5 |  |  | 124.98 |  |
Vested | (571.1) |  | — |  |  | (571.1) |  |  | 137.99 |  |
Forfeited | (38.1) |  | (31.7) |  |  | (69.8) |  |  | 136.00 |  |
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

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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 -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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