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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Revenues $ 1,170.0 $ 1,138.3 $ 2,206.9 $ 2,294.0
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:        
Cost of services $ 698.9 $ 653.0 $ 1,328.4 $ 1,308.1
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 228.5 $ 221.3 $ 431.2 $ 484.4
Total expenses 927.4 874.3 1,759.6 1,792.5
Operating income 242.6 264.0 447.3 501.5
Other income/(expense):        
Gain on divestiture of business (Note 4)       151.4
Interest income 4.2 1.8 7.4 2.4
Interest expense (27.0) (24.8) (52.0) (49.6)
Other expense, net (3.4) (4.8) (5.3) (7.3)
Total other income/(expense), net (26.2) (27.8) (49.9) 96.9
Income before income taxes 216.4 236.2 397.4 598.4
Provision for income taxes 40.2 42.2 69.4 111.1
Net income $ 176.2 $ 194.0 $ 328.0 $ 487.3
Earnings per share:        
Basic (USD per share) $ 0.47 $ 0.5 $ 0.88 $ 1.25
Diluted (USD per share) $ 0.47 $ 0.5 $ 0.87 $ 1.25
Weighted-average shares outstanding:        
Basic (shares) 375.0 386.7 374.7 389.9
Diluted (shares) 375.6 387.6 375.6 391.0