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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenues $ 1,036.9 $ 1,155.7
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:    
Cost of services $ 629.5 $ 655.1
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 202.7 $ 263.1
Total expenses 832.2 918.2
Operating income 204.7 237.5
Other income/(expense):    
Gain on divestiture of business (Note 4) 0.0 151.4
Interest income 3.2 0.6
Interest expense (25.0) (24.8)
Other expense, net (1.9) (2.5)
Total other income/(expense), net (23.7) 124.7
Income before income taxes 181.0 362.2
Provision for income taxes 29.2 68.9
Net income $ 151.8 $ 293.3
Earnings per share:    
Basic (USD per share) $ 0.41 $ 0.75
Diluted (USD per share) $ 0.40 $ 0.74
Weighted-average shares outstanding:    
Basic (shares) 374.4 393.1
Diluted (shares) 375.5 394.5