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Revenue and Receivables - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 5,307,111	$ 5,314,787	$ 5,125,657
CSB
Disaggregation of Revenue [Line Items]
Total revenue	4,146,028	4,325,189	4,080,347
Commercial
Disaggregation of Revenue [Line Items]
Total revenue	1,113,732	989,598	1,045,310
Solar
Disaggregation of Revenue [Line Items]
Total revenue	47,351	0	0
Monitoring and related services
Disaggregation of Revenue [Line Items]
Total revenue	4,347,713	4,186,987	4,307,582
Monitoring and related services | CSB
Disaggregation of Revenue [Line Items]
Total revenue	3,873,285	3,760,614	3,891,075
Monitoring and related services | Commercial
Disaggregation of Revenue [Line Items]
Total revenue	474,428	426,373	416,507
Installation and other
Disaggregation of Revenue [Line Items]
Total revenue	959,398	1,127,800	818,075
Installation and other | CSB
Disaggregation of Revenue [Line Items]
Total revenue	272,743	564,575	189,272
Installation and other | Commercial
Disaggregation of Revenue [Line Items]
Total revenue	639,304	563,225	628,803
Installation and other | Solar
Disaggregation of Revenue [Line Items]
Total revenue	$ 47,351	$ 0	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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