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Segment Reporting
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
We have organized our operations into the following three operating segments, which correspond directly to our reportable segments: Multicloud Services, Apps & Cross Platform, and OpenStack Public Cloud. Our segments are based upon a number of factors, including, the basis for our budgets and forecasts, organizational and management structure and the financial information regularly used by our Chief Operating Decision Maker to make key decisions and to assess performance. We assess financial performance of our segments on the basis of revenue and non-GAAP gross profit, which is a non-GAAP measure of profitability. For the calculation of non-GAAP gross profit, we allocate certain costs, such as data center operating costs, customer support costs, license expense, and depreciation, to our segments generally based on segment revenue.

The table below presents a reconciliation of revenue by reportable segment to consolidated revenue and a reconciliation of segment non-GAAP gross profit to total consolidated gross profit for the three months ended March 31, 2020 and 2021.
Three Months Ended March 31,
(In millions)20202021
Revenue by segment:
Multicloud Services$507.9 $579.6 
Apps & Cross Platform81.5 97.3 
OpenStack Public Cloud63.3 49.0 
    Total consolidated revenue$652.7 $725.9 
Non-GAAP gross profit by segment:
Multicloud Services $196.8 $196.4 
Apps & Cross Platform30.1 34.9 
OpenStack Public Cloud29.3 18.6 
Less:
Share-based compensation expense(1.8)(4.9)
Other compensation expense (1)
(1.9)(1.3)
Purchase accounting impact on expense (2)
(1.9)(1.2)
Restructuring and transformation expenses (3)
(1.3)(7.2)
Total consolidated gross profit$249.3 $235.3 

(1)    Adjustments for retention bonuses, mainly in connection with restructuring and transformation projects, and the related payroll tax, and payroll taxes associated with the exercise of stock options and vesting of restricted stock.
(2)    Adjustment for the impact of purchase accounting from the Rackspace Acquisition on expenses.
(3)    Adjustment for the impact of business transformation and optimization activities, as well as associated severance, facility closure costs and lease termination expenses.