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Revenue
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following tables represent a disaggregation of revenue by timing of revenue along with the reportable segment for each category:
Three Months Ended March 31, 2021
Cryo Tank SolutionsHeat Transfer SystemsSpecialty ProductsRepair, Service & LeasingIntersegment EliminationsConsolidated
Point in time$98.7 $5.6 $61.9 $26.7 $(2.9)$190.0 
Over time5.2 63.6 15.4 14.7 (0.4)98.5 
Total$103.9 $69.2 $77.3 $41.4 $(3.3)$288.5 
Three Months Ended March 31, 2020
Cryo Tank SolutionsHeat Transfer SystemsSpecialty ProductsRepair, Service & LeasingIntersegment EliminationsConsolidated
Point in time$89.8 $7.1 $38.8 $28.0 $(1.5)$162.2 
Over time8.2 105.8 14.1 12.7 (1.1)139.7 
Total$98.0 $112.9 $52.9 $40.7 $(2.6)$301.9 
Refer to Note 3, “Reportable Segments,” for a table of revenue by reportable segment disaggregated by geography.
Contract Balances
The following table represents changes in our contract assets and contract liabilities balances:
March 31, 2021December 31, 2020Year-to-date Change ($)Year-to-date Change (%)
Contract assets
Accounts receivable, net of allowances$186.4 $200.8 $(14.4)(7.2)%
Unbilled contract revenue74.6 79.4 (4.8)(6.0)%
Contract liabilities
Customer advances and billings in excess of contract revenue$106.3 $118.9 $(12.6)(10.6)%
Long-term deferred revenue0.2 1.9 (1.7)(89.5)%
Revenue recognized for the three months ended March 31, 2021 and 2020, that was included in the contract liabilities balance at the beginning of each year was $52.5 and $17.1, respectively. The amount of revenue recognized during the three months ended March 31, 2021 from performance obligations satisfied or partially satisfied in previous periods as a result of changes in the estimates of variable consideration related to long-term contracts, was not significant.
Remaining Performance Obligations
Remaining performance obligations represent the transaction price of firm signed purchase orders or other written contractual commitments from customers for which work has not been performed, or is partially completed, and excludes unexercised contract options and potential orders. As of March 31, 2021, the estimated revenue expected to be recognized in the future related to remaining performance obligations was $934.1. We expect to recognize revenue on approximately 76% of the remaining performance obligations over the next 12 months and with the remaining over the next few years thereafter.