| Segment Information | 
Segment information for the twelve months ended December 31, 2022, 2021 and 2020 and as of December 31, 2022 and 2021 is as follows:
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Twelve Months Ended December 31,
 |  
| Operating revenue: |  | 2022 |  | 2021 |  | 2020 |  
|  |  | (In millions) |  
| Workforce Solutions |  | $ | 2,325.4 |  |  | $ | 2,035.4 |  |  | $ | 1,461.7 |  |  
| U.S. Information Solutions |  | 1,657.7 |  |  | 1,786.7 |  |  | 1,711.2 |  |  
| International |  | 1,139.1 |  |  | 1,101.8 |  |  | 954.6 |  |  
| Total operating revenue |  | $ | 5,122.2 |  |  | $ | 4,923.9 |  |  | $ | 4,127.5 |  |  
 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Twelve Months Ended December 31,
 |  
| Operating income: |  | 2022 |  | 2021 |  | 2020 |  
|  |  | (In millions) |  
| Workforce Solutions |  | $ | 1,006.0 |  |  | $ | 1,000.7 |  |  | $ | 703.9 |  |  
| U.S. Information Solutions |  | 402.1 |  |  | 551.8 |  |  | 515.3 |  |  
| International |  | 147.0 |  |  | 141.9 |  |  | 75.7 |  |  
| General Corporate Expense |  | (499.1) |  |  | (556.4) |  |  | (618.3) |  |  
| Total operating income |  | $ | 1,056.0 |  |  | $ | 1,138.0 |  |  | $ | 676.6 |  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | December 31, |  
| Total assets: |  | 2022 |  | 2021 |  
|  |  | (In millions) |  
| Workforce Solutions |  | $ | 4,156.5 |  |  | $ | 3,888.3 |  |  
| U.S. Information Solutions |  | 3,291.4 |  |  | 3,091.4 |  |  
| International |  | 3,106.8 |  |  | 3,271.5 |  |  
| General Corporate |  | 993.2 |  |  | 789.7 |  |  
| Total assets |  | $ | 11,547.9 |  |  | $ | 11,040.9 |  | 
 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Twelve Months Ended December 31,
 |  
| Depreciation and amortization expense: |  | 2022 |  | 2021 |  | 2020 |  
|  |  | (In millions) |  
| Workforce Solutions |  | $ | 162.2 |  |  | $ | 106.5 |  |  | $ | 71.9 |  |  
| U.S. Information Solutions |  | 191.4 |  |  | 158.5 |  |  | 120.2 |  |  
| International |  | 132.0 |  |  | 141.1 |  |  | 133.4 |  |  
| General Corporate |  | 74.5 |  |  | 74.3 |  |  | 65.5 |  |  
| Total depreciation and amortization expense |  | $ | 560.1 |  |  | $ | 480.4 |  |  | $ | 391.0 |  |  
 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Twelve Months Ended December 31,
 |  
| Capital expenditures: |  | 2022 |  | 2021 |  | 2020 |  
|  |  | (In millions) |  
| Workforce Solutions |  | $ | 113.5 |  |  | $ | 73.5 |  |  | $ | 74.6 |  |  
| U.S. Information Solutions |  | 125.7 |  |  | 92.9 |  |  | 126.0 |  |  
| International |  | 144.8 |  |  | 123.8 |  |  | 68.3 |  |  
| General Corporate |  | 233.4 |  |  | 200.3 |  |  | 161.8 |  |  
| Total capital expenditures* |  | $ | 617.4 |  |  | $ | 490.5 |  |  | $ | 430.7 |  |  *Amounts above include accruals for capital expenditures. | 
| Financial Information by Geographic Area | 
Financial information by geographic area is as follows:
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | Twelve Months Ended December 31,
 |  
|  |  | 2022 |  | 2021 |  | 2020 |  
|  |  |  |  |  |  | (In millions) |  |  |  |  |  
| Operating revenue (based on location of customer): |  | Amount |  | % |  | Amount |  | % |  | Amount |  | % |  
| U.S. |  | $ | 3,983.1 |  |  | 78 | % |  | $ | 3,822.2 |  |  | 78 | % |  | $ | 3,172.9 |  |  | 77 | % |  
| Australia |  | 325.2 |  |  | 6 | % |  | 336.9 |  |  | 7 | % |  | 282.6 |  |  | 7 | % |  
| U.K. |  | 265.5 |  |  | 5 | % |  | 252.0 |  |  | 5 | % |  | 222.9 |  |  | 5 | % |  
| Canada |  | 256.1 |  |  | 5 | % |  | 250.0 |  |  | 5 | % |  | 212.6 |  |  | 5 | % |  
| Other |  | 292.3 |  |  | 6 | % |  | 262.8 |  |  | 5 | % |  | 236.5 |  |  | 6 | % |  
| Total operating revenue |  | $ | 5,122.2 |  |  | 100 | % |  | $ | 4,923.9 |  |  | 100 | % |  | $ | 4,127.5 |  |  | 100 | % |  
 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  | December 31, |  
|  |  | 2022 |  | 2021 |  
|  |  |  |  | (In millions) |  |  |  
| Long-lived assets: |  | Amount |  | % |  | Amount |  | % |  
| U.S. |  | $ | 7,448.4 |  |  | 73 | % |  | $ | 7,035.9 |  |  | 71 | % |  
| Australia |  | 1,718.6 |  |  | 17 | % |  | 1,901.9 |  |  | 19 | % |  
| U.K. |  | 263.6 |  |  | 3 | % |  | 280.5 |  |  | 3 | % |  
| Canada |  | 200.4 |  |  | 2 | % |  | 193.3 |  |  | 2 | % |  
| Other |  | 546.4 |  |  | 5 | % |  | 508.4 |  |  | 5 | % |  
| Total long-lived assets |  | $ | 10,177.4 |  |  | 100 | % |  | $ | 9,920.0 |  |  | 100 | % |  |