Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

The following table disaggregates our revenues by type within each of our business segments:

The following table summarizes the activity in our contract liabilities for the reporting period:



	Three Months Ended March 31,
	2018
Contract liability balance, beginning of period⁽¹⁾	$	88.2
Liabilities recognized during the period	36.4
Amounts recognized in revenue from beginning balance	(25.0		)
Contract liability balance, end of period⁽¹⁾	$	99.6
(1) Contract liabilities are included within accrued liabilities and other long-term liabilities in our consolidated balance sheet.

The following table summarizes our opening and closing balances in these accounts (other than contract liabilities disclosed above):

Receivables

Contract Assets⁽¹⁾

Opening balance, January 1, 2018

Closing balance, March 31, 2018

(1) Contract assets are included primarily within prepaid expenses, deposits and other current assets in our March 31, 2018 consolidated balance sheet.