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Deferred Revenue and Remaining Performance Obligations (Tables)
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Contract with Customer Rollforward
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