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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]      
Revenues $ 4,357.0 $ 4,475.5 $ 5,070.8
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:      
Cost of services $ 2,671.7 $ 2,626.4 $ 2,896.4
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 867.8 $ 964.2 $ 1,051.3
Total expenses [1] 3,539.5 3,590.6 3,947.7
Operating income 817.5 884.9 1,123.1
Other income/(expense):      
Gain on divestiture of business (Note 4) 18.0 248.3  
Gain on the sale of noncontrolling interest in a private company (Note 4)     47.9
Pension settlement charges (Note 11)     (109.8)
Interest income 15.6 13.9 1.4
Interest expense (105.3) (101.0) (105.5)
Other expense, net 0.0 (37.5) (21.7)
Total other income/(expense), net (71.7) 123.7 (187.7)
Income before income taxes 745.8 1,008.6 935.4
Provision for income taxes 119.8 98.0 129.6
Net income $ 626.0 $ 910.6 $ 805.8
Earnings per share:      
Basic (USD per share) $ 1.69 $ 2.35 $ 1.98
Diluted (USD per share) $ 1.68 $ 2.34 $ 1.97
Weighted-average shares outstanding:      
Basic (shares) 370.8 387.2 406.8
Diluted (shares) 371.8 388.4 408.9
[1] As further described in Note 6, total expenses include amounts incurred with related parties of $45.4 million, $48.8 million, and $54.7 million for the years ended December 31, 2023, 2022, and 2021, respectively.