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REVENUES FROM CONTRACTS WITH CUSTOMERS
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
REVENUES FROM CONTRACTS WITH CUSTOMERS REVENUES FROM CONTRACTS WITH CUSTOMERS
The Company provides RWCS, which provide collection and processing of regulated and specialized waste, including medical, pharmaceutical and hazardous waste, for disposal and compliance programs and communication solutions, and SID services, which provide for the collection of personal and confidential information for secure destruction and recycling of shredded paper. 
The Company’s customers typically enter into a contract for the provision of services on a regular and scheduled basis, e.g., weekly, monthly or on an as needed basis over the contract term, e.g. one-time service. Under the contract terms, the Company receives fees based on a monthly, quarterly or annual rate and/or fees based on contractual rates depending upon measures including the volume, weight, and type of waste, number and size of containers collected, weight and type of shredded paper, and number of call minutes.
Amounts are invoiced based on the terms of the underlying contract either on a regular basis, e.g., monthly or quarterly, or as services are performed and are generally due within a short period of time after invoicing based upon normal terms and conditions for our business type and the geography of the services performed.
Disaggregation of Revenue
In the first quarter of 2021, we updated our service lines to include Communication Solutions (formally part of CRS) in RWCS. This reclassification was driven by the divestiture of the Company's global product recall business (Expert Solutions) in December of 2020 and the remaining Communication Solutions service line synergies with the Company's RWCS customers. For 2020 and 2019 periods presented, amounts have been recast to reflect this change.
In millions
Year Ended Year Ended December 31,
202120202019
Revenue by Service
Regulated Waste and Compliance Services$1,854.0 $1,930.2 $2,407.0 
Secure Information Destruction Services792.9 745.3 901.9 
Total Revenues$2,646.9 $2,675.5 $3,308.9 
North America
Regulated Waste and Compliance Services$1,457.5 $1,541.9 $1,970.4 
Secure Information Destruction Services679.0 647.3 769.5 
Total North America Segment$2,136.5 $2,189.2 $2,739.9 
International
Regulated Waste and Compliance Services$396.5 $388.3 $436.6 
Secure Information Destruction Services113.9 98.0 132.4 
Total International Segment$510.4 $486.3 $569.0 
Contract Liabilities
Contract liabilities at December 31, 2021 and 2020 were $9.0 million and $8.8 million, respectively.  Substantially all of the contract liabilities as of December 31, 2021 are expected to be recognized as revenue during the year ending December 31, 2022 and substantially all of the balance as of December 31, 2020 was recognized as revenue during the year ended December 31, 2021.
Contract Acquisition Costs
The Company’s incremental direct costs of obtaining a contract, which consist primarily of sales incentives, are deferred and amortized to SG&A over a weighted average estimated period of benefit of 6.5 years.
During the year ended December 31, 2021, 2020, and 2019 the Company amortized $12.7 million, $10.6 million, and $9.1 million, respectively, of deferred sales incentives to SG&A.
Total contract acquisition costs, net of accumulated amortization, were classified as follows as of December 31:
In millions
20212020
Other current assets$12.4 $11.1 
Other assets34.3 31.1 
Total contract acquisition costs$46.7 $42.2