Revenue

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

The total amount of the transaction price for our revenue contracts allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of December 31, 2020 (Successor) is as follows:

	2021		2022		2023		2024		2025		Thereafter		Total
Future revenue	$	1,138.2	$	534.2	$	261.1	$	94.6	$	66.2	$	134.8	$	2,229.1

The table of future revenue does not include any amount of variable consideration that is a sales or usage-based royalty in exchange for distinct data licenses or that is allocated to a distinct service period within a single performance obligation that is a series of distinct service periods.

Contract Balances

	Successor				Predecessor
	At December 31, 2020		At December 31, 2019		At December 31, 2018
Accounts receivable, net	$	313.7	$	269.3	$	270.8
Short-term contract assets	$	1.4	$	1.0	$	1.3
Long-term contract assets	$	3.8	$	2.8	$	2.6
Short-term deferred revenue	$	467.2	$	467.5	$	529.1
Long-term deferred revenue	$	16.3	$	7.8	$	7.3

The increase in deferred revenue of $8.2 million from December 31, 2019 to December 31, 2020 was primarily due to cash payments received or due in advance of satisfying our performance obligations, largely offset by approximately $472.5 million of revenue recognized that were included in the deferred revenue balance at December 31, 2019, net of the purchase accounting fair value adjustment as a result of our Take-Private Transaction in February 2019.

The increase in contract assets of $1.4 million is primarily due to new contract assets recognized, net of new amounts reclassified to receivables during 2020, largely offset by $3.2 million of contract assets included in the balance at January 1, 2020 that were reclassified to receivables when they became unconditional.

The decrease in deferred revenue of $61.1 million from December 31, 2018 (Predecessor) to December 31, 2019

(Successor) was primarily due to $390.1 million of revenue recognized that was included in the deferred revenue balance at December 31, 2018 (Predecessor), net of the purchase accounting fair value adjustment as a result of our Take-Private Transaction in February 2019, largely offset by cash payments received or due in advance of satisfying our performance obligations. The change in short-term and long-term contract assets was not significant.

See Note 18 for schedule of disaggregation of revenue.

Assets Recognized for the Costs to Obtain a Contract

Commission assets, net of accumulated amortization included in deferred costs, were $83.6 million and $47.0 million as of December 31, 2020 and December 31, 2019, respectively.

The amortization of commission assets is as follows:

Period	Amortization
Year ended December 31, 2020 (Successor)	$	17.0
Period from January 1 to December 31, 2019 (Successor)	$	4.7
Period from January 1 to February 7, 2019 (Predecessor)	$	3.2
Year ended December 31, 2018 (Predecessor)	$	26.9