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PROPERTY AND EQUIPMENT.
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT
PROPERTY AND EQUIPMENT.

Property and equipment at December 31 consists of: 
(in millions)
2018
 
2017
Computer and communications software and equipment
$
864.7

 
$
824.4

Buildings and improvements
454.5

 
442.5

Leasehold improvements
137.0

 
121.0

Furniture and other equipment
178.9

 
168.9

Land
37.4

 
37.4

Leased land
2.7

 
2.7

 
1,675.2

 
1,596.9

Less accumulated depreciation and amortization
1,013.9

 
944.9

Total
$
661.3

 
$
652.0



Compensation and related costs attributable to the development of computer software for internal use, totaling $85.5 million in 2018, $62.3 million in 2017, and $28.9 million in 2016, have been capitalized.

We occupy certain office facilities and lease computer and other equipment under noncancelable operating leases. Related rental expense was $40.1 million in 2018, $36.0 million in 2017, and $32.8 million in 2016. Future minimum payments under these leases aggregate to: $31.5 million in 2019, $26.8 million in 2020, $22.9 million in 2021, $17.9 million in 2022, $15.2 million in 2023, and $53.4 million in later years.