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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
Dec. 31, 2024
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Maximum Exposure $ 23.0
Liability Recorded $ 12.0
Credit Support Under Letters of Credit for Deductibles Due by Us on Our Own Insurance Coverage's Expires After 2028 [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Collateral None
Compensation to Us None
Maximum Exposure $ 9.2
Liability Recorded $ 12.0
Credit Enhancement Under Letters of Credit for Our Captive Insurance Operations to Meet Minimum Statutory Capital Requirement's Expires After 2028 [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Collateral None
Compensation to Us Reimbursement of LOC fees
Maximum Exposure $ 13.0
Collateral Related To Claim Funds Held in a Fiduciary Capacity by a Recent Acquisition Expires 2028 [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Collateral None
Compensation to Us None
Maximum Exposure $ 0.8