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Disclosures about Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Company's Financial Instruments Whose Carrying Amount Did Not Equal Fair Value The cost and estimated fair value of the investments in mortgage and private loans were:
As of
December 31, 2024December 31, 2023
(in millions)CostFair ValueCostFair Value
Mortgage Loans$210.1 $214.2 $144.8 $148.8 
Private Loans 577.3 597.2 — — 
Total$787.4 $811.4 $144.8 $148.8 
A summary of our financial instruments whose carrying value did not equal fair value is shown below:
December 31,
 20242023
(in millions)Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
Junior subordinated debentures:
Trust preferred debentures$162.0 $163.9 $160.8 $165.9 
Subordinated debentures81.2 81.3 80.4 83.3 
Total junior subordinated debentures243.2 245.2 241.2 249.2 
Senior unsecured fixed rate notes128.8 128.6 128.0 132.7 
Total$372.0 $373.8 $369.2 $381.9 
Schedule of Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Based on an analysis of the inputs, our financial instruments measured at fair value on a recurring basis have been categorized as follows:
 Fair Value Measurements at Reporting Date Using
(in millions)December 31, 2024
Level 1 (1)
Level 2 (2)
Level 3 (3)
Junior subordinated debentures:    
Trust preferred debentures$163.9 $— $163.9 $— 
Subordinated debentures81.3 — 81.3 — 
Total junior subordinated debentures245.2 — 245.2 — 
Senior unsecured fixed rate notes128.6 128.6 — — 
Total$373.8 $128.6 $245.2 $— 
(1)Quoted prices in active markets for identical assets
(2)Significant other observable inputs
(3)Significant unobservable inputs
 Fair Value Measurements at Reporting Date Using
(in millions)December 31, 2023
Level 1 (1)
Level 2 (2)
Level 3 (3)
Junior subordinated debentures:    
Trust preferred debentures$165.9 $— $165.9 $— 
Subordinated debentures83.3 — 83.3 — 
Total junior subordinated debentures249.2 — 249.2 — 
Senior unsecured fixed rate notes132.7 132.7 — — 
Total$381.9 $132.7 $249.2 $— 
(1)Quoted prices in active markets for identical assets
(2)Significant other observable inputs
(3)Significant unobservable inputs