Annual report [Section 13 and 15(d), not S-K Item 405]

SEGMENT INFORMATION - Segment Information (Details)

v3.25.4
SEGMENT INFORMATION - Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Disclosure [Line Items]      
Operating revenue $ 6,074.5 $ 5,681.1 $ 5,265.2
Cost of services 2,645.6 2,518.7 2,335.1
Selling, general and administrative expenses 1,614.2 1,450.5 1,385.7
Depreciation and amortization 719.5 669.8 610.8
Operating income 1,095.2 1,042.1 933.6
General corporate expense (4,979.3) (4,639.0) (4,331.6)
Other income (expense), net 12.0 (2.5) 25.7
Interest expense (212.3) (229.1) (241.4)
Consolidated income before income taxes 894.9 810.5 717.9
Total assets 11,864.2 11,759.4  
Total capital expenditures 480.2 495.9 585.8
Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 6,074.5 5,681.1 5,265.2
Cost of services 2,521.6 2,381.9 2,161.4
Selling, general and administrative expenses 1,131.4 1,068.6 1,071.8
Depreciation and amortization 622.3 591.7 529.9
Operating income 1,799.2 1,638.9 1,502.1
General corporate expense      
Segment Reporting Disclosure [Line Items]      
General corporate expense (704.0) (596.8) (568.5)
Total assets 813.3 816.7  
Total capital expenditures 144.4 111.2 205.5
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment      
Segment Reporting Disclosure [Line Items]      
Other income (expense), net 12.0 (2.5) 25.7
Interest expense (212.3) (229.1) (241.4)
Workforce Solutions      
Segment Reporting Disclosure [Line Items]      
Operating revenue 2,582.3 2,433.8 2,315.8
Workforce Solutions | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 2,582.3 2,433.8 2,315.8
Cost of services 940.5 883.4 830.9
Selling, general and administrative expenses 316.0 318.7 339.1
Depreciation and amortization 184.3 178.4 176.5
Operating income 1,141.5 1,053.3 969.3
Total capital expenditures 95.8 96.0 127.5
U.S. Information Solutions | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 2,078.5 1,893.0 1,720.4
Cost of services 939.0 861.1 751.5
Selling, general and administrative expenses 413.0 390.2 398.1
Depreciation and amortization 251.3 237.3 205.8
Operating income 475.2 404.4 365.0
Total capital expenditures 102.8 161.2 131.3
Total International      
Segment Reporting Disclosure [Line Items]      
Operating revenue 1,413.7 1,354.3 1,229.0
Total International | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 1,413.7 1,354.3 1,229.0
Cost of services 642.1 637.4 579.0
Selling, general and administrative expenses 402.4 359.7 334.6
Depreciation and amortization 186.7 176.0 147.6
Operating income 182.5 181.2 167.8
Total assets 3,629.2 3,451.6  
Total capital expenditures 137.2 127.5 121.5
Workforce | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Total assets 4,067.6 4,104.9  
Total U.S. Information Solutions      
Segment Reporting Disclosure [Line Items]      
Operating revenue 2,078.5 1,893.0 $ 1,720.4
Total U.S. Information Solutions | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Total assets $ 3,354.1 $ 3,386.2