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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
CONSOLIDATED STATEMENTS OF INCOME        
Revenues $ 1,138.3 $ 1,289.7 $ 2,294.0 $ 2,499.7
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:        
Cost of services $ 653.0 $ 755.0 $ 1,308.1 $ 1,461.0
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 221.3 $ 279.8 $ 484.4 $ 551.0
Total expenses 874.3 1,034.8 1,792.5 2,012.0
Operating income 264.0 254.9 501.5 487.7
Other income/(expense):        
Gain on divestitures of businesses (Note 4)     151.4  
Interest income 1.8 0.3 2.4 0.7
Interest expense (24.8) (25.6) (49.6) (54.0)
Other income/(expense), net (4.8) 30.5 (7.3) 28.6
Total other income/(expense), net (27.8) 5.2 96.9 (24.7)
Income before income taxes 236.2 260.1 598.4 463.0
Provision for income taxes 42.2 37.6 111.1 58.7
Net income $ 194.0 $ 222.5 $ 487.3 $ 404.3
Earnings per share:        
Basic (USD per share) $ 0.50 $ 0.54 $ 1.25 $ 0.98
Diluted (USD per share) $ 0.50 $ 0.54 $ 1.25 $ 0.98
Weighted-average shares outstanding:        
Basic (shares) 386.7 409.3 389.9 410.5
Diluted (shares) 387.6 411.5 391.0 412.9