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Property and Equipment
 12 Months Ended
Dec. 29, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment (which are carried at cost) as of 2018 and 2017 year end are as follows: 
(Amounts in millions)
 
2018
 
2017
Land
 
$
31.7

 
$
24.5

Buildings and improvements
 
368.6

 
357.4

Machinery, equipment and computer software
 
944.4

 
889.2

Property and equipment – gross
 
1,344.7

 
1,271.1

Accumulated depreciation and amortization
 
(849.6
)
 
(786.7
)
Property and equipment – net
 
$
495.1

 
$
484.4


The estimated service lives of property and equipment are principally as follows: 
Buildings and improvements
  
3 to 50 years
Machinery, equipment and computer software
  
2 to 15 years

The cost and accumulated depreciation of property and equipment under capital leases as of 2018 and 2017 year end are as follows: 
(Amounts in millions)
 
2018
 
2017
Buildings and improvements
 
$
21.8

 
$
21.4

Accumulated depreciation
 
(15.4
)
 
(14.0
)
Net book value
 
$
6.4

 
$
7.4


Depreciation expense was $68.8 million, $65.6 million and $61.4 million in 2018, 2017 and 2016, respectively.