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PROPERTY, EQUIPMENT AND SOFTWARE
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
PROPERTY, EQUIPMENT AND SOFTWARE PROPERTY, EQUIPMENT AND SOFTWARE.
Property, equipment and software at December 31 consists of: 
(in millions)20232022
Computer and communications software and equipment$1,497.3 $1,364.6 
Buildings and improvements490.7 488.9 
Leasehold improvements260.9 236.3 
Furniture and other equipment207.8 209.7 
Land25.7 25.7 
2,482.4 2,325.2 
Less accumulated depreciation and amortization1,675.8 1,569.5 
Total$806.6 $755.7 

Compensation and related costs attributable to the development of computer software for internal use, totaling $156.1 million in 2023, $134.6 million in 2022, and $137.6 million in 2021, have been capitalized.