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Deferred Revenue and Remaining Performance
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Deferred Revenue and Remaining Performance Obligations DEFERRED REVENUE AND REMAINING PERFORMANCE OBLIGATIONS
Deferred Revenue
Changes in our deferred revenue during 2021 and 2020 were as follows: 
20212020
(In millions)
Beginning balance of the period$613.8 $541.9 
Revenue recognized (533.8)(476.9)
Billing and other net activities551.8 548.8 
Ending balance of the period$631.8 $613.8 
Remaining Performance Obligations
At the end of 2021, approximately $1.8 billion of revenue is expected to be recognized from remaining performance obligations for which goods or services have not been delivered, primarily subscription, post-contract services and hardware, and to a lesser extent, professional services. We expect to recognize $1.4 billion or 76% of our remaining performance obligations as revenue during the next 12 months and the remainder thereafter.