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Schedule 4 - Reinsurance Schedule (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Life Insurance in Force      
Gross Amount $ 20,287.7 $ 19,706.2 $ 19,479.9
Ceded to Other Companies 372.3 387.7 411.6
Assumed from Other Companies 144.5 152.3 162.8
Net Amount $ 20,059.9 $ 19,470.8 $ 19,231.1
Percentage of Amount Assumed to Net 0.70% 0.80% 0.80%
Premiums      
Gross Amount $ 5,255.1 $ 4,652.6 $ 4,407.5
Ceded to Other Companies 36.1 31.2 27.4
Assumed from Other Companies 34.7 50.8 92.3
Net Amount $ 5,253.7 $ 4,672.2 $ 4,472.4
Percentage of Amount Assumed to Net 0.70% 1.10% 2.10%
Life Insurance      
Premiums      
Gross Amount $ 401.9 $ 386.0 $ 383.6
Ceded to Other Companies 0.9 1.1 1.2
Assumed from Other Companies 0.7 0.8 0.9
Net Amount $ 401.7 $ 385.7 $ 383.3
Percentage of Amount Assumed to Net 0.20% 0.20% 0.20%
Accident and Health Insurance      
Premiums      
Gross Amount $ 185.8 $ 195.5 $ 188.5
Ceded to Other Companies 0.3 1.6 1.7
Assumed from Other Companies 4.4 5.4 5.3
Net Amount $ 189.9 $ 199.3 $ 192.1
Percentage of Amount Assumed to Net 2.30% 2.70% 2.80%
Property and Liability Insurance      
Premiums      
Gross Amount $ 4,667.4 $ 4,071.1 $ 3,835.4
Ceded to Other Companies 34.9 28.5 24.5
Assumed from Other Companies 29.6 44.6 86.1
Net Amount $ 4,662.1 $ 4,087.2 $ 3,897.0
Percentage of Amount Assumed to Net 0.60% 1.10% 2.20%