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INVESTMENT INCOME (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Net Investment Income
The following table summarizes the net investment income for December 31, 2019, 2018 and 2017 (in millions):
 
Years Ended December 31,
 
2019
 
2018
 
2017
 
(in millions)
Fixed maturities
$
46.4

 
$
39.8

 
$
34.2

Affiliated dividends
6.7

 
8.2

 
6.2

Mortgage loans
0.6

 
0.6

 
0.6

Policy loans
2.9

 
2.2

 
1.5

Cash and short-term instruments
1.8

 
1.3

 
0.5

Investment expense and other
(2.7
)
 
(3.7
)
 
(3.5
)
Amortization of IMR
—

 
0.8

 
0.7

Net investment income
$
55.7

 
$
49.2

 
$
40.2