Summary of Significant Accounting Policies - Pension (Details)	12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]
Defined benefit plan net actuarial gains and losses in excess of fair value of plan assets or plan's projected benefit obligation percentage	10.00%

Defined benefit plan net actuarial gains and losses in excess of fair value of plan assets or projected benefit obligation percentage.

No definition available.

Name:	rezi_DefinedBenefitPlanNetActuarialGainsAndLossesInExcessOfFairValueOfPlanAssetsOrProjectedBenefitObligationPercentage
Namespace Prefix:	rezi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration