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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Statement [Abstract]        
Revenues $ 1,066.4 $ 1,170.0 $ 2,115.5 $ 2,206.9
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:        
Cost of services $ 663.9 $ 698.9 $ 1,305.2 $ 1,328.4
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 211.8 $ 228.5 $ 427.5 $ 431.2
Total expenses 875.7 927.4 1,732.7 1,759.6
Operating income 190.7 242.6 382.8 447.3
Other income/(expense):        
Interest income 3.7 4.2 6.8 7.4
Interest expense (31.1) (27.0) (57.2) (52.0)
Other income/(expense), net 1.9 (3.4) 2.8 (5.3)
Total other expense, net (25.5) (26.2) (47.6) (49.9)
Income before income taxes 165.2 216.4 335.2 397.4
Provision for income taxes 24.2 40.2 51.5 69.4
Net income $ 141.0 $ 176.2 $ 283.7 $ 328.0
Earnings per share:        
Basic (USD per share) $ 0.42 $ 0.47 $ 0.83 $ 0.88
Diluted (USD per share) $ 0.41 $ 0.47 $ 0.83 $ 0.87
Weighted-average shares outstanding:        
Basic (shares) 338.6 375.0 341.5 374.7
Diluted (shares) 339.6 375.6 342.6 375.6