Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of Remaining Performance Obligation

The Company expects to recognize remaining performance obligations as revenue in future periods as follows:

(millions)	Remaining Performance Obligations
2020	$	62.8
2021	39.5
2022	21.5
2023	14.2
2024	8.0
2025 and thereafter	6.9
Total	$	152.9

Schedule of Contract with Customer, Asset and Liability

Information about changes to contract liability balances for the year ended December 31, 2019 and 2018 are presented below:

(millions)	2019			2018
Balance as of January 1	$	(19.1	)	$	(20.5	)
Additional contract liabilities	(19.4		)	(19.1		)
Recognition of revenue from contract liabilities	19.1			20.5
Balance as of December 31	$	(19.4	)	$	(19.1	)

Information about changes to contract asset balances for the year ended December 31, 2019 and 2018 are presented below:

(millions)	2019			2018
Balance as of January 1	$	11.4		$	12.2
Additional contract assets	11.0			11.4
Reclassification to accounts receivable	(11.4		)	(12.2		)
Balance as of December 31	$	11.0		$	11.4

nformation about contract assets and contract liabilities with customers and clients as of December 31, 2019 and 2018 is presented below:

(millions)	2019		2018
Accounts receivable	$	151.3	$	139.3
Contract asset	11.0		11.4
Contract liability	19.4		19.1

Schedule of Amortization Expense Related to Cost of Contracts

Amortization expense of cost of contracts related to service concession arrangements within the scope of Topic 853 is recorded as a reduction of revenue and was not significant for the years ended December 31, 2019, 2018 and 2017, respectively.