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Property and Equipment
 12 Months Ended
Dec. 30, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment

Note 5: Property and Equipment

Property and equipment (which are carried at cost) as of 2017 and 2016 year end are as follows:

 

(Amounts in millions)    2017      2016  

Land

        $       24.5              $       19.1      

Buildings and improvements

      357.4            309.4      

Machinery, equipment and computer software

      889.2            809.6      
  

 

 

     

 

 

  

Property and equipment – gross

      1,271.1            1,138.1      

Accumulated depreciation and amortization

      (786.7)           (712.9)     
  

 

 

     

 

 

  

Property and equipment – net

        $ 484.4              $ 425.2      
  

 

 

     

 

 

  

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 2017 and 2016 year end are as follows:

 

(Amounts in millions)    2017      2016  

Buildings and improvements

        $       21.4              $       20.5      

Accumulated depreciation

      (14.0)           (12.3)     
  

 

 

     

 

 

  

Net book value

        $ 7.4              $ 8.2      
  

 

 

     

 

 

  

Depreciation expense was $65.6 million, $61.4 million and $57.8 million in 2017, 2016 and 2015, respectively.