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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Revenues $ 1,089.6 $ 1,286.3 $ 3,383.6 $ 3,786.0
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:        
Cost of services $ 637.3 $ 720.1 $ 1,945.4 $ 2,181.1
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 220.5 $ 247.6 $ 704.9 $ 798.6
Total expenses 857.8 967.7 2,650.3 2,979.7
Operating income 231.8 318.6 733.3 806.3
Other income/(expense):        
Gain on divestitures of businesses (Note 4)     151.4  
Interest income 4.9 0.4 7.3 1.1
Interest expense (25.2) (25.7) (74.8) (79.7)
Other income/(expense), net (17.8) (1.8) (25.1) 26.8
Total other income/(expense), net (38.1) (27.1) 58.8 (51.8)
Income before income taxes 193.7 291.5 792.1 754.5
Provision for income taxes 19.8 58.8 130.9 117.5
Net income $ 173.9 $ 232.7 $ 661.2 $ 637.0
Earnings per share:        
Basic (USD per share) $ 0.45 $ 0.57 $ 1.70 $ 1.56
Diluted (USD per share) $ 0.45 $ 0.57 $ 1.70 $ 1.55
Weighted-average shares outstanding:        
Basic (shares) 386.5 406.3 388.8 409.1
Diluted (shares) 387.6 408.0 389.9 411.3