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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Revenues $ 1,032.6 $ 1,036.0 $ 3,042.3 $ 3,151.5
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:        
Cost of services $ 643.2 $ 653.6 $ 1,905.2 $ 1,958.8
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 187.5 $ 217.5 $ 565.1 $ 645.0
Total expenses 830.7 871.1 2,470.3 2,603.8
Operating income 201.9 164.9 572.0 547.7
Other income/(expense):        
Interest income 2.4 2.8 5.9 9.6
Interest expense (37.0) (32.2) (106.3) (89.4)
Other income, net 0.3 0.2 3.0 3.0
Total other expense, net (34.3) (29.2) (97.4) (76.8)
Income before income taxes 167.6 135.7 474.6 470.9
Provision for/(benefit from) income taxes (Note 12) 28.0 (129.1) 89.4 (77.6)
Net income $ 139.6 $ 264.8 $ 385.2 $ 548.5
Earnings per share:        
Basic (USD per share) $ 0.43 $ 0.78 $ 1.17 $ 1.61
Diluted (USD per share) $ 0.43 $ 0.78 $ 1.17 $ 1.61
Weighted-average shares outstanding:        
Basic (shares) 322.1 338.3 329.5 340.5
Diluted (shares) 322.8 339.5 330.5 341.6