The Company’s revenue is generated from Maintenance Services and Development Services. The Company generally recognizes revenue from the sale of services as the services are performed, typically ratably over the term of the contract(s), which the Company believes to be the best measure of progress. The Company recognizes revenues as it transfers control of products and services to its customers. The Company recognizes revenue in an amount reflecting the total consideration it expects to receive from the customer. Revenue is recognized according to the following five step model: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenues when a performance obligation is satisfied. The Company determined that for contracts containing multiple performance obligations, stand-alone selling price is readily determinable for each performance obligation and therefore allocation of the transaction price to multiple performance obligations is not necessary. The transaction price will include estimates of variable consideration, such as returns and provisions for doubtful accounts and sales incentives, to the extent it is probable that a significant reversal of revenue recognized will not occur. In all cases, when a sale is recorded by the Company, no significant uncertainty exists surrounding the purchaser’s obligation to pay.

The Company’s Maintenance Services revenues are generated primarily through landscape maintenance services and snow removal services. Landscape maintenance services that are primarily viewed as non-discretionary, such as lawn care, mowing, gardening, mulching, leaf removal, irrigation and tree care, are provided under recurring annual contracts, which typically range from one to three years in duration and are generally cancellable by the customer with 30 days’ notice. Snow removal services are provided on either fixed fee based contracts or per occurrence contracts. Both landscape maintenance services and snow removal services can also include enhancement services that represent supplemental maintenance or improvement services generally provided under contracts of short duration related to specific services. Revenue for landscape maintenance and snow removal services under fixed fee models is recognized over time using an output based method. Additionally, a portion of the Company’s recurring fixed fee landscape maintenance and snow removal services are recorded under the series guidance. The right to invoice practical expedient, defined below, is generally applied to revenue related to landscape maintenance and snow removal services performed in relation to per occurrence contracts as well as enhancement services. When use of the practical expedient is not appropriate for these contracts, revenue is recognized using a cost-to-cost input method. Fees for contracted landscape maintenance services are typically billed on an equal monthly basis. Fees for fixed fee snow removal services are typically billed on an equal monthly basis during snow season, while fees for time and material or other activity-based snow removal services are typically billed as the services are performed. Fees for enhancement services are typically billed as the services are performed.

For Development Services, revenue is primarily recognized over time using the cost-to-cost input method, measured by the percentage of cost incurred to date to the estimated total cost for each contract, which we believe to be the best measure of progress. The full amount of anticipated losses on contracts is recorded as soon as such losses can be estimated. These losses have been immaterial in prior periods. Changes in job performance, job conditions, and estimated profitability, including final contract settlements, may result in revisions to costs and revenue and are recognized in the period in which the revisions are determined.

The following table presents the Company’s reportable segment revenues, disaggregated by revenue type. The Company disaggregates revenue from contracts with customers into major services lines. The Company has determined that disaggregating revenue into these categories achieves the disclosure objective to depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. As noted in the business segment reporting information in Note 14 “Segments”, the Company’s reportable segments are Maintenance Services and Development Services.

	Three Months Ended December 31,
	2019			2018
Landscape Maintenance	$	363.3		$	344.5
Snow Removal		55.6			48.0
Maintenance Services		418.9			392.5
Development Services		152.8			134.4
Eliminations		(1.0	)		(0.9	)
Net service revenues	$	570.7		$	526.0

Remaining performance obligations represent the estimated revenue expected to be recognized in the future related to performance obligations which are fully or partially unsatisfied at the end of the period.

As of December 31, 2019, the estimated future revenues for remaining performance obligations that are part of a contract that has an original expected duration of greater than one year was approximately $388.2. The Company expects to recognize revenue on 62% of the remaining performance obligations over the next 12 months and an additional 38% over the 12 months thereafter.

In accordance with the disclosure provisions of ASU 2014-09, the paragraph above excludes the following, i) estimated future revenues for performance obligations that are part of a contract that has an original expected duration of one year or less, ii) contracts with variable consideration that is allocated entirely to unsatisfied performance obligations or to a wholly unsatisfied promise accounted for under the series guidance and iii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

When a contract results in revenue being recognized in excess of the amount the Company has invoiced or has the right to invoice to the customer, a contract asset is recognized. Contract assets are transferred to accounts receivable, net when the rights to the consideration become unconditional. Contract assets are presented as Unbilled revenue on the consolidated balance sheets.

Contract liabilities consist of payments received from customers, or such consideration that is contractually due, in advance of providing the product or performing services such that control has not passed to the customer. Contract liabilities are presented as Deferred revenue on the consolidated balance sheets.

Changes in deferred revenue for the three month period ended December 31, 2019 were as follows:

	Deferred Revenue
Balance, October 1, 2019	$	49.1
Recognition of revenue		(214.7	)
Deferral of revenue		232.1
Balance, December 31, 2019	$	66.5

There were $33.8 of amounts billed during the period and $11.1 of additions to our unbilled revenue balance during the three month period from October 1, 2019 to December 31, 2019.

The Company offers certain interest-free contracts to customers where payments are received over a period not exceeding one year. Additionally, certain Maintenance Services and Development Services customers may pay in advance for services. The Company does not adjust the promised amount of consideration for the effects of these financing components. At contract inception, the period of time between the performance of services and the customer payment is one year or less.

As permitted under the practical expedient available under ASU No. 2014-09, the Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less, (ii) contracts with variable consideration that is allocated entirely to unsatisfied performance obligations or to a wholly unsatisfied promise accounted for under the series guidance, and (iii) contracts for which the Company recognizes revenue at the amount which we have the right to invoice for services performed.