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Commitments, Contingencies and Off-Balance Sheet Arrangements - Outstanding Letters of Credit, Financial Guarantees and Funding Commitments (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Maximum Exposure | $ 22.6
Liability Recorded | $ 18.3
Funding Commitment to an Equity Investment - to be Funded in 2022 [Member] | Other Investments [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | None
Compensation to Us | None
Maximum Exposure | $ 0.5
Credit Support Under Letters of Credit for Deductibles Due by Us on Our Own Insurance Coverage's Expires After 2025 [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | None
Compensation to Us | None
Maximum Exposure | $ 9.4
Liability Recorded | $ 18.3
Credit Enhancement Under Letters of Credit for Our Captive Insurance Operations to Meet Minimum Statutory Capital Requirement's Expires After 2025 [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | None
Compensation to Us | Reimbursement of LOC fees
Maximum Exposure | $ 6.1
Collateral Related to Claims Funds Held in a Fiduciary Capacity by a Recent Acquisition Expires 2021 [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | None
Compensation to Us | None
Maximum Exposure | $ 0.9
Credit Support under Letters of Credit in lieu of Security Deposits for two Leases from Acquisitions - Expires after 2023 and 2026 [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | None
Compensation to Us | None
Maximum Exposure | $ 0.6
Financial Guarantees of Loans to Five Canadian Based Employees Trigger [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | (1)
Compensation to Us | None
Maximum Exposure | $ 1.0
Financial Guarantee of External Loan to Subsidiary in Chile Expires when Loan Balance is Reduced to Zero through July 2024 - Principal and Interest are Paid Quarterly [Member] |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |
Collateral | None
Compensation to Us | None
Maximum Exposure | $ 4.1

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