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PROPERTY AND EQUIPMENT.
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT
PROPERTY AND EQUIPMENT.

Property and equipment at December 31 consists of: 
(in millions)
2016
 
2017
Computer and communications software and equipment
$
704.0

 
$
824.4

Buildings and improvements
422.0

 
442.5

Leasehold improvements
108.2

 
121.0

Furniture and other equipment
158.3

 
168.9

Land
40.3

 
37.4

Leased land
2.7

 
2.7

 
1,435.5

 
1,596.9

Less accumulated depreciation and amortization
820.4

 
944.9

Total
$
615.1

 
$
652.0



Compensation and related costs attributable to the development of computer software for internal use totaling $22.3 million in 2015, $28.9 million in 2016, and $62.3 million in 2017 have been capitalized.

We occupy certain office facilities and lease computer and other equipment under noncancelable operating leases. Related rental expense was $31.1 million in 2015, $32.8 million in 2016, and $36.0 million in 2017. Future minimum payments under these leases aggregate $37.8 million in 2018, $37.2 million in 2019, $32.9 million in 2020, $29.6 million in 2021, $24.6 million in 2022, and $100.5 million in later years.