Quarterly report [Sections 13 or 15(d)]

SEGMENT INFORMATION - Segment Information (Details)

v3.25.1
SEGMENT INFORMATION - Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Operating Revenue $ 1,442.0 $ 1,389.4  
Cost of services (exclusive of depreciation and amortization below) 656.7 627.7  
Selling, general and administrative expenses 374.9 372.6  
Depreciation and amortization expenses 174.6 164.4  
Operating income 235.8 224.7  
General corporate expense (1,206.2) (1,164.7)  
Other income, net 2.5 1.6  
Interest expense (52.9) (59.7)  
Consolidated income before income taxes 185.4 166.6  
Assets 11,854.8   $ 11,759.4
Total capital expenditures 101.2 124.7  
Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 1,442.0 1,389.4  
Cost of services (exclusive of depreciation and amortization below) 623.2 593.1  
Selling, general and administrative expenses 272.0 271.5  
Depreciation and amortization expenses 151.6 145.2  
Operating income 395.2 379.6  
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Segment Reporting Information [Line Items]      
General corporate expense (159.4) (154.9)  
Assets 820.5   816.7
Total capital expenditures 24.1 28.3  
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment      
Segment Reporting Information [Line Items]      
Other income, net 2.5 1.6  
Interest expense (52.9) (59.7)  
Workforce Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 618.6 602.8  
Cost of services (exclusive of depreciation and amortization below) 233.0 223.9  
Selling, general and administrative expenses 76.9 79.5  
Depreciation and amortization expenses 44.6 44.3  
Operating income 264.1 255.1  
Total capital expenditures 20.3 23.6  
U.S. Information Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 499.9 465.3  
Cost of services (exclusive of depreciation and amortization below) 232.7 213.9  
Selling, general and administrative expenses 98.2 102.4  
Depreciation and amortization expenses 63.3 56.4  
Operating income 105.7 92.6  
Total capital expenditures 26.4 42.7  
International | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 323.5 321.3  
Cost of services (exclusive of depreciation and amortization below) 157.5 155.3  
Selling, general and administrative expenses 96.9 89.6  
Depreciation and amortization expenses 43.7 44.5  
Operating income 25.4 31.9  
Assets 3,519.1   3,451.6
Total capital expenditures 30.4 $ 30.1  
Workforce Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Assets 4,098.6   4,104.9
U.S. Information Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Assets $ 3,416.6   $ 3,386.2