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Deferred Revenue And Performance Obligations (Tables)
 9 Months Ended
Sep. 27, 2019
Revenue Recognition and Deferred Revenue [Abstract]  
Deferred Revenue And Performance Obligations
Changes in the Company’s deferred revenue during the third quarter of fiscal 2019 and 2018 were as follows: 
  
Third Quarter of
 
First Three Quarters of
(In millions)
2019
 
2018
 
2019
 
2018
Beginning balance of the period
$
452.4

 
$
356.2

 
$
387.2

 
$
276.6

Revenue recognized
(76.7
)
 
(41.5
)
 
(300.5
)
 
(201.7
)
Acquired deferred revenue
1.5

 
26.6

 
1.5

 
50.3

Net deferred revenue activity
41.8

 
23.0

 
330.8

 
239.1

Ending balance of the period
$
419.0

 
$
364.3

 
$
419.0

 
$
364.3