Revenue (Tables)

6 Months Ended

Jun. 30, 2022

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
2022	$	43.5
2023		62.0
2024		40.3
2025		20.5
2026		14.1
2027 and thereafter		10.0
Total	$	190.4

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 June 30, 2022 (unaudited) and December 31, 2021:

(millions)	June 30, 2022			December 31, 2021
Accounts receivable	$	153.1		$	137.3
Contract asset		—			2.3
Contract liability		(8.3	)		(15.7	)

The following table provides information about changes to contract assets during the six months ended June 30, 2022 and 2021 (unaudited):

	Six Months Ended
(millions)	June 30, 2022			June 30, 2021
Balance, beginning of period	$	2.3		$	8.6
Additional contract assets		—			7.7
Reclassification to accounts receivable		(2.3	)		(8.6	)
Balance, end of period	$	—		$	7.7

The following table provides information about changes to contract liabilities during the six months ended June 30, 2022 and 2021 (unaudited):

	Six Months Ended
(millions)	June 30, 2022			June 30, 2021
Balance, beginning of period	$	(15.7	)	$	(12.5	)
Additional contract liabilities		(8.3	)		(9.9	)
Recognition of revenue from contract liabilities		15.7			12.5
Balance, end of period	$	(8.3	)	$	(9.9	)

Schedule of Cost of Contracts Expense

Cost of contracts expense related to service concession arrangements within the scope of Topic 853 and certain management type contracts are recorded as a reduction of revenue.  Cost of contracts expense during three and six months ended June 30, 2022 and 2021 (unaudited) was as follows:

	Three Months Ended				Six Months Ended
(millions)	June 30, 2022		June 30, 2021		June 30, 2022		June 30, 2021
Cost of contracts expense	$	0.3	$	0.3	$	0.5	$	0.5