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Commitments and Contingent Liabilities (Tables) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Reinsurance Ceded and Other Related Data
Years Ended December 31:
 
2019
 
2018
 
2017
General Insurance Group
 
 
 
 
 
 
Written premiums:
Direct
 
$
4,966.4

 
$
4,673.4

 
$
4,422.4

 
Assumed
 
66.9

 
58.1

 
59.0

 
Ceded
 
$
1,564.3

 
$
1,351.1

 
$
1,236.2

 
 
 
 
 
 
 
 
Earned premiums:
Direct
 
$
4,857.0

 
$
4,534.8

 
$
4,307.5

 
Assumed
 
56.4

 
55.8

 
49.7

 
Ceded
 
$
1,481.1

 
$
1,313.5

 
$
1,246.4

Claims ceded
 
 
$
910.2

 
$
745.0

 
$
728.0

 
 
 
 
 
 
 
 
RFIG Run-off Business
 
 
 
 
 
 
Written premiums:
Direct
 
$
57.5

 
$
73.9

 
$
119.0

 
Assumed
 
—

 
—

 
—

 
Ceded
 
$
—

 
$
—

 
$
.5

 
 
 
 
 
 
 
 
Earned premiums:
Direct
 
$
59.2

 
$
75.9

 
$
123.5

 
Assumed
 
—

 
—

 
—

 
Ceded
 
$
—

 
$
—

 
$
.5

Claims ceded
 
 
$
—

 
$
—

 
$
—

 
 
 
 
 
 
 
 
Mortgage Guaranty Insurance in force as of December 31:
 
 
 
 
 
 
 
Direct
 
$
10,156.8

 
$
13,100.5

 
$
16,543.9

 
Assumed
 
—

 
—

 
—

 
Ceded
 
$
—

 
$
—

 
$
2.4


    
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
The following table presents a summary of future undiscounted lease payments as of the dates shown.
 
 
 
 
 
 
 
 
 
Lease
 
Year 1
Year 2
Year 3
Year 4
Year 5
Thereafter
Total
Discount
Liability
December 31, 2019
$
59.0

$
50.6

$
42.9

$
33.5

$
24.4

$
100.9

$
311.6

$
73.6

$
238.0

December 31, 2018
$
60.4

$
48.9

$
39.5

$
32.7

$
24.0

$
103.6

$
309.4

 
 

    
Gain (Loss) on Investments $ 636.1 $ (235.6) $ 211.6