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Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial Assets    
Fair value of issued securities $ 6,239.3 $ 6,345.3
Equity securities at fair value 147.2 121.6
Mortgage-backed securities    
Financial Assets    
Fair value of issued securities 662.5 684.8
Other, including U.S. Treasury securities    
Financial Assets    
Fair value of issued securities 365.9 433.2
Municipal bonds    
Financial Assets    
Fair value of issued securities 1,703.4 1,827.5
Foreign government bonds    
Financial Assets    
Fair value of issued securities 43.6 45.1
Corporate bonds    
Financial Assets    
Fair value of issued securities 2,388.7 2,122.9
Other asset-backed securities    
Financial Assets    
Fair value of issued securities 1,075.2 1,231.8
Carrying Value    
Financial Assets    
Equity securities at fair value 147.2 121.6
Short-term investments 157.8 141.8
Other investments 43.6 36.3
Totals 6,587.9 6,645.0
Separate account (variable annuity) assets 3,441.0 2,891.4
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 2.1 2.5
Other policyholder funds, embedded derivatives 106.6 104.5
Carrying Value | Recurring    
Financial Assets    
Fair value of issued securities 6,239.3 6,345.3
Carrying Value | Mortgage-backed securities    
Financial Assets    
Fair value of issued securities 662.5 684.8
Carrying Value | Other, including U.S. Treasury securities    
Financial Assets    
Fair value of issued securities 365.9 433.2
Carrying Value | Municipal bonds    
Financial Assets    
Fair value of issued securities 1,703.4 1,827.5
Carrying Value | Foreign government bonds    
Financial Assets    
Fair value of issued securities 43.6 45.1
Carrying Value | Corporate bonds    
Financial Assets    
Fair value of issued securities 2,388.7 2,122.9
Carrying Value | Other asset-backed securities    
Financial Assets    
Fair value of issued securities 1,075.2 1,231.8
Fair Value    
Financial Assets    
Equity securities at fair value 147.2 121.6
Short-term investments 157.8 141.8
Other investments 43.6 36.3
Totals 6,587.9 6,645.0
Separate account (variable annuity) assets 3,441.0 2,891.4
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 2.1 2.5
Other policyholder funds, embedded derivatives 106.6 104.5
Fair Value | Recurring    
Financial Assets    
Fair value of issued securities 6,239.3 6,345.3
Fair Value | Mortgage-backed securities    
Financial Assets    
Fair value of issued securities 662.5 684.8
Fair Value | Other, including U.S. Treasury securities    
Financial Assets    
Fair value of issued securities 365.9 433.2
Fair Value | Municipal bonds    
Financial Assets    
Fair value of issued securities 1,703.4 1,827.5
Fair Value | Foreign government bonds    
Financial Assets    
Fair value of issued securities 43.6 45.1
Fair Value | Corporate bonds    
Financial Assets    
Fair value of issued securities 2,388.7 2,122.9
Fair Value | Other asset-backed securities    
Financial Assets    
Fair value of issued securities 1,075.2 1,231.8
Fair Value | Level 1    
Financial Assets    
Equity securities at fair value 35.2 39.2
Short-term investments 157.8 137.7
Other investments 0.0 0.0
Totals 225.6 210.2
Separate account (variable annuity) assets 3,441.0 2,891.4
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 0.0 0.0
Other policyholder funds, embedded derivatives 0.0 0.0
Fair Value | Level 1 | Recurring    
Financial Assets    
Fair value of issued securities 32.6 33.3
Fair Value | Level 1 | Mortgage-backed securities    
Financial Assets    
Fair value of issued securities 0.0 0.0
Fair Value | Level 1 | Other, including U.S. Treasury securities    
Financial Assets    
Fair value of issued securities 17.7 18.4
Fair Value | Level 1 | Municipal bonds    
Financial Assets    
Fair value of issued securities 0.0 0.0
Fair Value | Level 1 | Foreign government bonds    
Financial Assets    
Fair value of issued securities 0.0 0.0
Fair Value | Level 1 | Corporate bonds    
Financial Assets    
Fair value of issued securities 14.9 14.9
Fair Value | Level 1 | Other asset-backed securities    
Financial Assets    
Fair value of issued securities 0.0 0.0
Fair Value | Level 2    
Financial Assets    
Equity securities at fair value 110.6 82.1
Short-term investments 0.0 4.1
Other investments 43.6 36.3
Totals 5,990.9 6,079.7
Separate account (variable annuity) assets 0.0 0.0
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 2.1 2.5
Other policyholder funds, embedded derivatives 0.0 0.0
Fair Value | Level 2 | Recurring    
Financial Assets    
Fair value of issued securities 5,836.7 5,957.2
Fair Value | Level 2 | Mortgage-backed securities    
Financial Assets    
Fair value of issued securities 662.5 673.7
Fair Value | Level 2 | Other, including U.S. Treasury securities    
Financial Assets    
Fair value of issued securities 348.2 414.8
Fair Value | Level 2 | Municipal bonds    
Financial Assets    
Fair value of issued securities 1,642.6 1,767.9
Fair Value | Level 2 | Foreign government bonds    
Financial Assets    
Fair value of issued securities 43.6 45.1
Fair Value | Level 2 | Corporate bonds    
Financial Assets    
Fair value of issued securities 2,163.5 1,952.2
Fair Value | Level 2 | Other asset-backed securities    
Financial Assets    
Fair value of issued securities 976.3 1,103.5
Fair Value | Level 3    
Financial Assets    
Equity securities at fair value 1.4 0.3
Short-term investments 0.0 0.0
Other investments 0.0 0.0
Totals 371.4 355.1
Separate account (variable annuity) assets 0.0 0.0
Financial Liabilities    
Investment contract and life policy reserves, embedded derivatives 0.0 0.0
Other policyholder funds, embedded derivatives 106.6 104.5
Fair Value | Level 3 | Recurring    
Financial Assets    
Fair value of issued securities 370.0 354.8
Fair Value | Level 3 | Mortgage-backed securities    
Financial Assets    
Fair value of issued securities 0.0 11.1
Fair Value | Level 3 | Other, including U.S. Treasury securities    
Financial Assets    
Fair value of issued securities 0.0 0.0
Fair Value | Level 3 | Municipal bonds    
Financial Assets    
Fair value of issued securities 60.8 59.6
Fair Value | Level 3 | Foreign government bonds    
Financial Assets    
Fair value of issued securities 0.0 0.0
Fair Value | Level 3 | Corporate bonds    
Financial Assets    
Fair value of issued securities 210.3 155.8
Fair Value | Level 3 | Other asset-backed securities    
Financial Assets    
Fair value of issued securities $ 98.9 $ 128.3