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Property and Equipment (Tables)
 12 Months Ended
Dec. 29, 2018
Property, Plant and Equipment [Abstract]  
Schedule of 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
Summary of Estimated Service Lives of Property and Equipment
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
Summary of Cost and Accumulated Depreciation of Property and Equipment under Capital Leases
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