Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents our revenue disaggregated by revenue type. Sales and usage-based taxes are excluded from revenue.

	Year ended December 31
(in millions)	2019		2018		2017
License-based	$	812.7	$	751.6	$	667.7
Asset-based	211.6		200.4		182.2
Transaction-based	154.7		67.9		61.8
Consolidated revenue	$	1,179.0	$	1,019.9	$	911.7

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

We expect to recognize revenue related to our contract liabilities for 2020 and subsequent years as follows:

(in millions)	As of December 31, 2019
2020	$	437.1
2021	107.1
2022	44.4
2023	14.2
2024	8.9
Thereafter	55.0
Total	$	666.7

Summary of Contract Assets and Change in Deferred Commissions

The following table summarizes our contract assets balance:

	As of December 31
(in millions)	2019		2018
Accounts receivable, less allowance for doubtful accounts	$	188.5	$	172.2
Deferred commissions	30.4		25.1
Total contract assets	$	218.9	$	197.3

The following table shows the change in our deferred commissions balance from January 1, 2019 to December 31, 2019:

	(in millions)
Balance as of January 1, 2019	$	25.1
Commissions earned and capitalized	24.9
Amortization of capitalized amounts	(19.6		)
Balance as of December 31, 2019	$	30.4