Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION - Segment Information (Details)

v3.24.0.1
SEGMENT INFORMATION - Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Disclosure [Line Items]      
Operating revenue $ 5,265.2 $ 5,122.2 $ 4,923.9
Operating income 933.6 1,056.0 1,138.0
Total assets 12,280.0 11,547.9  
Depreciation and amortization expense 610.8 560.1 480.4
Capital expenditures 585.8 617.4 490.5
General Corporate Expense      
Segment Reporting Disclosure [Line Items]      
Operating income (568.5) (499.1) (556.4)
Total assets 930.2 993.2  
Depreciation and amortization expense 80.9 74.5 74.3
Capital expenditures 205.5 233.4 200.3
Workforce Solutions      
Segment Reporting Disclosure [Line Items]      
Operating revenue 2,315.8 2,325.4 2,035.4
Workforce Solutions | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 2,315.8 2,325.4 2,035.4
Operating income 969.3 1,006.0 1,000.7
Total assets 4,144.7 4,156.5  
Depreciation and amortization expense 176.5 162.2 106.5
Capital expenditures 127.5 113.5 73.5
U.S. Information Solutions | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 1,720.4 1,657.7 1,786.7
Operating income 365.0 402.1 551.8
Total assets 3,296.1 3,291.4  
Depreciation and amortization expense 205.8 191.4 158.5
Capital expenditures 131.3 125.7 92.9
International      
Segment Reporting Disclosure [Line Items]      
Operating revenue 1,229.0 1,139.1 1,101.8
International | Operating Segments      
Segment Reporting Disclosure [Line Items]      
Operating revenue 1,229.0 1,139.1 1,101.8
Operating income 167.8 147.0 141.9
Total assets 3,909.0 3,106.8  
Depreciation and amortization expense 147.6 132.0 141.1
Capital expenditures $ 121.5 $ 144.8 $ 123.8