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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract] |
Schedule of Depreciation Expense | Total depreciation expense on the Company’s property and equipment for December 31 was as follows:
In millions | 2023 |  | 2022 |  | 2021
Depreciation expense | $ | 110 |  |  | $ | 127 |  |  | $ | 139 |
Schedule of Activities Relating to Capitalized Internal-use Software | The following table identifies the activity relating to capitalized internal-use software for the following periods:
| Internal-use Software |  |
In millions | 2023 |  | 2022 |  | 2021 |  |  |  |  |  |
Beginning balance at January 1 | $ | 8 |  |  | $ | 10 |  |  | $ | 13 |  |  |  |  |  |  |
Capitalized | 2 |  |  | 3 |  |  | 3 |  |  |  |  |  |  |
Amortization | (5) |  |  | (5) |  |  | (6) |  |  |  |  |  |  |
Ending balance at December 31 | $ | 5 |  |  | $ | 8 |  |  | $ | 10 |  |  |  |  |  |  |
Schedule of Aggregate Amortization Expense for Internal-Use Software | The aggregate amortization expense (actual and estimated) for internal-use software for the following periods is:
| Actual |  | For the years ended (estimated)
In millions | 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028
Internal-use software amortization expense | $ | 5 |  |  | $ | 4 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 2 |
Schedule of Basic and Diluted Earnings Per Share | The components of basic and diluted earnings per share for the years ended December 31 are as follows:
In millions, except earnings per share | 2023 |  | 2022 |  | 2021
Net income attributable to common stockholders | $ | 62 |  |  | $ | 33 |  |  | $ | 147 |
Weighted average outstanding shares of common stock | 99.8 |  |  | 103.2 |  |  | 108.6 |
Dilutive effect of employee stock options, restricted shares and other stock awards | 2.6 |  |  | 2.6 |  |  | 4.3 |
Common stock and common stock equivalents | 102.4 |  |  | 105.8 |  |  | 112.9 |
Earnings per share: |  |  |  |  |
Basic | $ | 0.62 |  |  | $ | 0.32 |  |  | $ | 1.35 |
Diluted | $ | 0.61 |  |  | $ | 0.31 |  |  | $ | 1.30 |

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