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Description of Business, Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
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 millions202320222021
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 millions202320222021
Beginning balance at January 1$8 $10 $13 
Capitalized2 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:
 ActualFor the years ended (estimated)
In millions202320242025202620272028
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 share202320222021
Net income attributable to common stockholders$62 $33 $147 
Weighted average outstanding shares of common stock99.8 103.2 108.6 
Dilutive effect of employee stock options, restricted shares and other stock awards2.6 2.6 4.3 
Common stock and common stock equivalents102.4 105.8 112.9 
Earnings per share:
Basic$0.62 $0.32 $1.35 
Diluted$0.61 $0.31 $1.30