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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 9,523.6 $ 7,993.2 $ 7,358.2
Ceded Premiums Earned 2,039.0 1,718.9 1,495.8
Assumed Premiums Earned 75.1 71.5 57.4
Net premiums earned $ 7,559.8 $ 6,345.8 $ 5,919.9
Percentage of amount assumed to net 1.00% 1.10% 1.00%
Business Intersegment, Eliminations [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 0.0 $ 0.0 $ 0.0
Ceded Premiums Earned (0.4) (0.4) (0.9)
Assumed Premiums Earned (0.4) (0.4) (0.9)
Net premiums earned $ 0.0 $ 0.0 $ 0.0
Percentage of amount assumed to net 0.00% 0.00% 0.00%
Life Insurance in Force [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 1,473.2 $ 1,665.7 $ 2,119.0
Ceded Premiums Earned 878.5 936.8 1,135.9
Assumed Premiums Earned 0.0 0.0 0.0
Net premiums earned $ 594.6 $ 728.8 $ 983.0
Percentage of amount assumed to net 0.00% 0.00% 0.00%
Life Insurance [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 7.8 $ 7.8 $ 9.5
Ceded Premiums Earned 3.0 2.4 3.8
Assumed Premiums Earned 0.0 0.0 0.0
Net premiums earned $ 4.8 $ 5.3 $ 5.7
Percentage of amount assumed to net 0.00% 0.00% 0.00%
General Insurance [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 5,509.1 $ 5,030.2 $ 4,857.0
Ceded Premiums Earned 2,027.3 1,706.3 1,481.1
Assumed Premiums Earned 73.7 70.3 56.4
Net premiums earned $ 3,555.5 $ 3,394.2 $ 3,432.4
Percentage of amount assumed to net 2.10% 2.10% 1.60%
Title Insurance Group [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 3,958.6 $ 2,892.8 $ 2,412.8
Ceded Premiums Earned 0.0 0.1 0.0
Assumed Premiums Earned 1.8 1.6 1.9
Net premiums earned $ 3,960.5 $ 2,894.4 $ 2,414.8
Percentage of amount assumed to net 0.00% 0.10% 0.10%
RFIG Run-off [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 32.6 $ 45.1 $ 59.2
Ceded Premiums Earned 0.0 0.0 0.0
Assumed Premiums Earned 0.0 0.0 0.0
Net premiums earned $ 32.6 $ 45.1 $ 59.2
Percentage of amount assumed to net 0.00% 0.00% 0.00%
Accident and health Insurance [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 15.2 $ 17.1 $ 19.5
Ceded Premiums Earned 9.0 10.4 11.8
Assumed Premiums Earned 0.0 0.0 0.0
Net premiums earned $ 6.1 $ 6.6 $ 7.6
Percentage of amount assumed to net 0.00% 0.00% 0.00%
Life & Accident Insurance [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment      
Gross amount $ 23.1 $ 24.9 $ 29.0
Ceded Premiums Earned 12.1 12.9 15.6
Assumed Premiums Earned 0.0 0.0 0.0
Net premiums earned $ 11.0 $ 12.0 $ 13.4
Percentage of amount assumed to net 0.00% 0.00% 0.00%