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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Revenues $ 1,097.8 $ 1,089.6 $ 3,304.7 $ 3,383.6
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:        
Cost of services $ 687.2 $ 637.3 $ 2,015.6 $ 1,945.4
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 199.7 $ 220.5 $ 630.9 $ 704.9
Total expenses 886.9 857.8 2,646.5 2,650.3
Operating income 210.9 231.8 658.2 733.3
Other income/(expense):        
Gain on divestiture of business (Note 4) 18.0   18.0 151.4
Interest income 3.6 4.9 11.0 7.3
Interest expense (27.0) (25.2) (79.0) (74.8)
Other expense, net (1.2) (17.8) (6.5) (25.1)
Total other income/(expense), net (6.6) (38.1) (56.5) 58.8
Income before income taxes 204.3 193.7 601.7 792.1
Provision for income taxes 33.3 19.8 102.7 130.9
Net income $ 171.0 $ 173.9 $ 499.0 $ 661.2
Earnings per share:        
Basic (USD per share) $ 0.46 $ 0.45 $ 1.33 $ 1.7
Diluted (USD per share) $ 0.46 $ 0.45 $ 1.33 $ 1.7
Weighted-average shares outstanding:        
Basic (shares) 373.9 386.5 374.5 388.8
Diluted (shares) 375.0 387.6 375.4 389.9