XML 78 R42.htm IDEA: XBRL DOCUMENT v3.20.1
Investments - Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value of Investments (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fixed maturities    
Amortized cost $ 3,634.4 $ 3,605.0
Allowance for Credit Losses 31.6 0.0
Fair Value 3,523.5 3,633.5 [1]
Fixed Maturities [Member]    
Fixed maturities    
Amortized cost 3,634.4 3,605.0
Gross Unrealized Gains 69.0 68.5
Gross Unrealized Losses 148.3 40.0
Allowance for Credit Losses 31.6  
Fair Value 3,523.5 3,633.5
Fixed Maturities [Member] | U.S. Governments [Member]    
Fixed maturities    
Amortized cost 320.2 353.5
Gross Unrealized Gains 18.5 2.3
Gross Unrealized Losses 0.0 1.2
Allowance for Credit Losses 0.0  
Fair Value 338.7 354.6
Fixed Maturities [Member] | Foreign Governments [Member]    
Fixed maturities    
Amortized cost 245.9 244.8
Gross Unrealized Gains 4.6 4.6
Gross Unrealized Losses 10.4 0.7
Allowance for Credit Losses 0.4  
Fair Value 239.7 248.7
Fixed Maturities [Member] | Obligations of States and Political Subdivisions [Member]    
Fixed maturities    
Amortized cost 143.8 145.8
Gross Unrealized Gains 5.4 6.9
Gross Unrealized Losses 0.7 0.1
Allowance for Credit Losses 0.0  
Fair Value 148.5 152.6
Fixed Maturities [Member] | Corporate Bonds [Member]    
Fixed maturities    
Amortized cost 1,705.4 1,777.4
Gross Unrealized Gains 17.8 37.7
Gross Unrealized Losses 98.3 34.7
Allowance for Credit Losses 31.1  
Fair Value 1,593.8 1,780.4
Fixed Maturities [Member] | Commercial Mortgage-backed Securities [Member]    
Fixed maturities    
Amortized cost 242.9 213.5
Gross Unrealized Gains 2.4 4.6
Gross Unrealized Losses 3.5 1.1
Allowance for Credit Losses 0.0  
Fair Value 241.8 217.0
Fixed Maturities [Member] | Residential Mortgage-backed Securities [Member]    
Fixed maturities    
Amortized cost 534.0 479.1
Gross Unrealized Gains 18.8 10.4
Gross Unrealized Losses 6.4 0.6
Allowance for Credit Losses 0.0  
Fair Value 546.4 488.9
Fixed Maturities [Member] | Asset-backed Securities [Member]    
Fixed maturities    
Amortized cost 166.9 164.2
Gross Unrealized Gains 1.1 1.5
Gross Unrealized Losses 6.2 0.2
Allowance for Credit Losses 0.1  
Fair Value 161.7 165.5
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Fixed maturities    
Amortized cost 275.3 226.7
Gross Unrealized Gains 0.4 0.5
Gross Unrealized Losses 22.8 1.4
Allowance for Credit Losses 0.0  
Fair Value $ 252.9 $ 225.8
[1] Derived from audited consolidated financial statements.