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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value of Financial Instruments [Abstract]  
Estimated fair value of financial instruments table
The carrying value and the estimated fair value of the Company's financial instruments at fair value were as follows as of December 31:
20212020
Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
Financial assets(in millions)
Total investments at fair value (Note 5)$2,692.0 $2,692.0 $2,714.3 $2,714.3 
Cash and cash equivalents75.1 75.1 160.4 160.4 
Restricted cash and cash equivalents0.2 0.2 0.2 0.2 
Fair value, assets and liabilities measured on recurring basis table
The following table presents the Company's investments at fair value and the corresponding fair value measurements.
December 31, 2021December 31, 2020
Level 1Level 2Level 3Level 1Level 2Level 3
(in millions)
Fixed maturity securities
U.S. Treasuries$— $65.7 $— $— $78.3 $— 
U.S. Agencies— 2.4 — — 3.1 — 
States and municipalities— 436.1 — — 482.7 — 
Corporate securities— 1,080.3 — — 1,046.4 — 
Residential mortgage-backed securities— 321.8 — — 461.0 — 
Commercial mortgage-backed securities— 92.3 — — 102.4 — 
Asset-backed securities— 68.5 — — 42.6 — 
Collateralized loan obligations— 85.4 — — 83.6 — 
Foreign government securities— 12.5 — — 8.2 — 
Other securities— 177.7 — — 170.9 — 
Total fixed maturity securities$— $2,342.7 $— $— $2,479.2 $— 
Equity securities at fair value
Industrial and miscellaneous$283.1 $— $— $179.1 $— $— 
Other55.7 — — 29.4 — — 
Total equity securities at fair value$338.8 $— $— $208.5 $— $— 
Short-term investments$— $10.5 $— $4.0 $22.6 $— 
Total investments at fair value$338.8 $2,353.2 $— $212.5 $2,501.8 $— 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
The following table presents cash and investments carried at NAV on the Company's Consolidated Balance Sheets.
December 31, 2021December 31, 2020
Cash equivalents measured at NAV29.5 58.7 
Other invested assets carried at NAV38.4 16.2