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Run-off Lines (Tables)
 12 Months Ended
Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Gross Reserves for Run-Off Lines
The following table presents our gross reserves for Run-off Lines as of December 31:
 
December 31,
(in millions)
2019
 
2018
Asbestos and Environmental:
 
 
 
Reinsurance assumed
$
26.7

 
$
27.7

Other
25.9

 
27.1

Total Asbestos and Environmental
52.6

 
54.8

Risk-management
188.1

 
197.0

Run-off reinsurance lines
0.5

 
1.6

Other run-off lines
12.3

 
12.2

Gross reserves - Run-off Lines
$
253.5

 
$
265.6
Total Gross Reserves for Asbestos Exposure The following table represents the total gross reserves for our asbestos exposure:
 
December 31,
(in millions)
2019
 
2018
 
2017
Direct written
 
 
 
 
 
Case reserves
$
2.7

 
$
2.7

 
$
2.1

Unallocated loss adjustment expense ("ULAE")
0.5

 
0.5

 
0.5

Incurred but not reported ("IBNR")
16.1

 
19.1

 
18.8

Total direct written reserves
19.3

 
22.3

 
21.4

Assumed domestic
 
 
 
 
 
Case reserves
9.1

 
8.7

 
9.8

ULAE
0.8

 
0.8

 
0.8

IBNR
11.2

 
12.0

 
13.7

Total assumed domestic reserves
21.1

 
21.5

 
24.3

Assumed London
 
 
 
 
 
Case reserves
1.3

 
1.5

 
2.3

ULAE
—

 
—

 
—

IBNR
1.1

 
1.5

 
0.6

Total assumed London reserves
2.4

 
3.0

 
2.9

Total asbestos reserves
$
42.8

 
$
46.8

 
$
48.6
Underwriting Losses for Run-Off Lines
The following table presents our underwriting losses for Run-off Lines: 
 
For the Years Ended December 31,
(in millions)
2019
 
2018
 
2017
Asbestos and Environmental:
 
 
 
 
 
Reinsurance assumed
$
(4.4
)
 
$
(3.9
)
 
$
(8.7
)
Other
(3.8
)
 
(4.1
)
 
(6.7
)
Total Asbestos and Environmental
(8.3
)
 
(8.0
)
 
(15.4
)
Risk-management
(4.9
)
 
(2.6
)
 
(8.8
)
Run-off reinsurance lines
0.7

 
—

 
(0.1
)
Other run-off lines
(1.7
)
 
(5.3
)
 
(1.4
)
Total underwriting loss - Run-off Lines
$
(14.2
)
 
$
(15.9
)
 
$
(25.7
)