Worker's Compensation Claims - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Details)	3 Months Ended
	Mar. 31, 2022
2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2021 - Through June 30 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2021 - July 1 and After [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No