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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
Revenues $ 1,049.1 $ 1,036.9
Type of Revenue us-gaap:ServiceMember us-gaap:ServiceMember
Expenses:    
Cost of services $ 641.3 $ 629.5
Type of Cost of Service us-gaap:ServiceMember us-gaap:ServiceMember
Selling, general, and administrative $ 215.7 $ 202.7
Total expenses 857.0 832.2
Operating income 192.1 204.7
Other income/(expense):    
Interest income 3.1 3.2
Interest expense (26.1) (25.0)
Other income/(expense), net 0.9 (1.9)
Total other expense, net (22.1) (23.7)
Income before income taxes 170.0 181.0
Provision for income taxes 27.3 29.2
Net income $ 142.7 $ 151.8
Earnings per share:    
Basic (USD per share) $ 0.41 $ 0.41
Diluted (USD per share) $ 0.41 $ 0.4
Weighted-average shares outstanding:    
Basic (shares) 344.4 374.4
Diluted (shares) 345.7 375.5