Brinks Home Security Annual report pursuant to Section 13 and 15(d)

Commitments, Contingencies and Other Liabilities - Narrative (Details) contract in Thousands			4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 23, 2020 USD ($) contract	Jun. 17, 2020 USD ($) payment	Dec. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Purchase price			$ 0	$ 0	$ 10,914,000	$ 0
Protect America Assets Acquisition
Loss Contingencies [Line Items]
Purchase price		$ 16,600,000
Protect America Assets Acquisition \| Protect America Earnout Payments
Loss Contingencies [Line Items]
Number of monthly earnout payments \| payment		50
Estimated earnout liability		$ 86,000,000			83,211,000
Protect America Assets Acquisition \| Protect America Earnout Payments \| Other Noncurrent Liabilities
Loss Contingencies [Line Items]
Estimated earnout liability					56,275,000
Assets Acquired from Kourt Security Partners, LLC \| GSSA
Loss Contingencies [Line Items]
Number of alarm monitoring contracts acquired \| contract	40
Upfront payment	$ 10,914,000
Assets Acquired from Kourt Security Partners, LLC \| Kourt Security Partners, LLC, Earnout Payments \| GSSA
Loss Contingencies [Line Items]
Estimated earnout liability					31,392,000
Non-controlling interest liability	$ 31,300,000
Earnout payments liability, effective interest rate	10.90%
Assets Acquired from Kourt Security Partners, LLC \| Kourt Security Partners, LLC, Earnout Payments \| GSSA \| Other Noncurrent Liabilities
Loss Contingencies [Line Items]
Estimated earnout liability					$ 26,695,000