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Schedule II- Valuation and Qualifying Account
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Account Juniper Networks, Inc.
Schedule II - Valuation and Qualifying Accounts
Years Ended December 31, 2020, 2019, and 2018
 (In millions)
Allowance for Doubtful AccountsBalance at
Beginning of
Year		Charged to
(Reversed from)
Costs and
Expenses		Write-offs,
Net of
Recoveries		Balance at
End of
Year
2020$5.5 $4.4 $— $9.9 
2019$4.9 $1.7 $(1.1)$5.5 
2018$5.7 $(0.8)$— $4.9 
Sales Return ReserveBalance at
Beginning of
Year		Charged as a
Reduction in
Revenues		UsedBalance at
End of
Year
2020$24.8 $60.7 $(57.1)$28.4 
2019$32.7 $59.5 $(67.4)$24.8 
2018(*)
$44.5 $70.7 $(82.5)$32.7 
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(*) Upon adoption of Topic 606, the Company recorded a reduction of $10.7 million as part of the cumulative effect adjustment to the January 1, 2018 opening accumulated deficit balance on the Consolidated Balance Sheet.

All other schedules have been omitted as the required information is not applicable or the information is presented in the Consolidated Financial Statements or notes thereto under Item 8 herein.