Revenue (Tables)

3 Months Ended

Mar. 31, 2023

Revenue From Contract With Customer [Abstract]

Schedule of Remaining Performance Obligations

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

(millions) (unaudited)	Remaining Performance Obligations
2023	$	57.1
2024		51.5
2025		29.9
2026		21.7
2027		10.8
2028 and thereafter		17.1
Total	$	188.1

Schedule of Contract with Customer, Asset and Liabilities

The following table provides information about accounts receivable, contract assets and contract liabilities with customers and clients as of March 31, 2023 (unaudited) and December 31, 2022:

(millions)	March 31, 2023			December 31, 2022
Accounts receivable	$	162.4		$	169.9
Contract asset		0.5			1.8
Contract liabilities		(9.9	)		(17.4	)

Changes in contract assets, which include the recognition of additional consideration due from the client, are offset by reclassifications of contract asset balances to accounts receivable when the Company obtains an unconditional right to consideration, thereby establishing an accounts receivable. The following table provides information about changes to contract assets during the three months ended March 31, 2023 and 2022 (unaudited):

	Three Months Ended
(millions)	March 31, 2023			March 31, 2022
Balance, beginning of period	$	1.8		$	2.3
Additional contract assets		0.5			—
Reclassification to accounts receivable		(1.8	)		(2.3	)
Balance, end of period	$	0.5		$	—

Changes in contract liabilities primarily include additional contract liabilities and reductions of contract liabilities when revenue is recognized. The following table provides information about changes to contract liabilities during the three months ended March 31, 2023 and 2022 (unaudited):

	Three Months Ended
(millions)	March 31, 2023			March 31, 2022
Balance, beginning of period	$	(17.4	)	$	(15.7	)
Additional contract liabilities		(9.6	)		(8.2	)
Recognition of revenue from contract liabilities		17.1			15.7
Balance, end of period	$	(9.9	)	$	(8.2	)

Schedule of Cost of Contracts Expense

Cost of contracts expense related to service concession arrangements and certain management type contracts are recorded as a reduction of revenue. Cost of contracts expense during three months ended March 31, 2023 and 2022 (unaudited), which was included as a reduction to Services revenue within the Condensed Consolidated Statements of Income, was as follows:

	Three Months Ended
(millions)	March 31, 2023		March 31, 2022
Cost of contracts expense	$	0.2	$	0.2