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Deferred Revenue And Remaining Performance Obligations
9 Months Ended
Oct. 01, 2021
Revenue Recognition and Deferred Revenue [Abstract]  
DEFERRED REVENUE AND REMAINING PERFORMANCE OBLIGATIONS DEFERRED REVENUE AND REMAINING PERFORMANCE OBLIGATIONS
Deferred Revenue
Changes to our deferred revenue during the third quarter and first three quarters of 2021 and 2020 were as follows: 
  Third Quarter ofFirst Three Quarters of
(In millions) 2021202020212020
Beginning balance of the period$606.1 $531.0 $613.8 $541.9 
Revenue recognized (92.3)(87.6)(471.8)(419.5)
Net deferred revenue activity75.2 58.2 447.0 379.2 
Ending balance of the period$589.0 $501.6 $589.0 $501.6 
Remaining Performance Obligations
At the end of the third quarter of 2021, approximately $1.6 billion of revenue is expected to be recognized from remaining performance obligations for which goods or services have not been delivered, primarily subscription, software, and software maintenance, and to a lesser extent, hardware and professional services contracts. We expect to recognize $1.2 billion or 75% of our remaining performance obligations as revenue during the next 12 months, and the remainder thereafter.