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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Disaggregation of Revenue

The following table presents our revenue disaggregated by major product and service lines (in millions):
Three Months EndedNine Months Ended
September 30,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Product$223.8 $197.1 $628.0 $549.7 
Service:
Security subscription235.4 192.8 669.4 545.5 
Technical support and other191.9 158.2 549.0 449.7 
Total service revenue427.3 351.0 1,218.4 995.2 
Total revenue$651.1 $548.1 $1,846.4 $1,544.9