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Employee and Agent Benefits (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans    
Obligations and Funded Status (Table)  

​

​

​

​

​

​

​

​

​

​

​

December 31, 

 

​

    

2023

    

2022

 

​

​

(in millions)

 

Change in benefit obligation

​

​

​

​

​

​

​

Benefit obligation at beginning of year

​

$

(58.6)

​

$

(79.2)

​

Interest cost

​

​

(2.8)

​

 

(1.9)

​

Actuarial gain (loss)

​

​

(3.0)

​

 

17.0

​

Participant contributions

​

​

(6.1)

​

 

(6.4)

​

Benefits paid

​

​

13.6

​

 

11.9

​

Benefit obligation at end of year

​

$

(56.9)

​

$

(58.6)

​

​

​

​

​

​

​

​

​

Change in plan assets

​

​

​

​

​

​

​

Fair value of plan assets at beginning of year

​

$

70.4

​

$

89.5

​

Actual return on plan assets

​

​

9.6

​

 

(15.0)

​

Employer contribution

​

​

1.5

​

 

1.4

​

Participant contributions

​

​

6.1

​

 

6.4

​

Benefits paid

​

​

(13.6)

​

 

(11.9)

​

Fair value of plan assets at end of year

​

$

74.0

​

$

70.4

​

​

​

​

​

​

​

​

​

Amount recognized in statement of financial position

​

​

​

​

​

​

​

Other assets

​

$

17.1

​

$

11.8

​

Total

​

$

17.1

​

$

11.8

​

​

​

​

​

​

​

​

​

Amount recognized in accumulated other comprehensive income

​

​

​

​

​

​

​

Total net actuarial gain

​

$

(20.5)

​

$

(18.1)

​

Pre-tax accumulated other comprehensive income

​

$

(20.5)

​

$

(18.1)

​

​

Amounts Recognized in Net Periodic Benefit Cost and Accumulated Other Comprehensive (Income) Loss (Table)  

​

​

​

​

​

​

​

​

​

​

For the year ended December 31, 

​

    

2023

    

2022

​

​

(in millions)

Other changes recognized in accumulated other comprehensive (income) loss

​

​

​

​

​

​

Net actuarial (gain) loss

​

$

(3.1)

​

$

1.8

Amortization of net gain

​

​

0.7

​

 

0.8

Total recognized in pre-tax accumulated other comprehensive (income) loss

​

$

(2.4)

​

$

2.6

Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive income

​

$

(3.8)

​

$

(0.1)

​

Weighted-Average Assumptions Used to Determine Benefit Obligations (Table)  

​

​

​

​

​

​

​

​

​

December 31, 

​

​

     

2023

     

2022

​

Discount rate

​

4.80

%  

5.05

%

Rate of compensation increase

​

N/A

​

N/A

​

​

Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Table)  

​

​

​

​

​

​

​

​

​

​

​

For the year ended December 31, 

​

​

    

2023

    

2022

    

2021

​

Discount rate

​

5.05

%  

2.55

%  

2.15

%

Expected long-term return on plan assets

​

5.20

%  

4.25

%  

4.25

%

Rate of compensation increase

​

N/A

​

N/A

​

N/A

%

​

Assumed Health Care Cost Trend Rates (Table)  

​

​

​

​

​

​

​

​

​

December 31, 

 

​

   

2023

    

2022

​

Health care cost trend rate assumed for next year under age 65

​

7.50

%  

7.00

%

Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)

​

4.50

%  

4.50

%

Year that the rate reaches the ultimate trend rate (under age 65)

​

2032

​

2031

​

​

Estimated Future Benefit Payments (Table)  

​

​

​

​

​

​

​

Other postretirement

​

​

benefits (gross benefit

​

​

payments, including

​

    

prescription drug benefits)

​

​

(in millions)

Year ending December 31:

​

​

​

2024

​

$

11.2

2025

​

​

10.2

2026

​

​

9.1

2027

​

​

8.0

2028

​

​

7.2

2029-2033

​

​

29.7

​

Other postretirement benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Components of Other Postretirement Benefits Net Periodic Benefit Cost (Income) (Table)

​

​

​

​

​

​

​

​

​

​

Other postretirement benefits

​

​

For the six months ended June 30, 

​

    

2024

    

2023

​

​

(in millions)

Interest cost

​

$

1.3

​

$

1.4

Expected return on plan assets

​

​

(1.7)

​

​

(1.8)

Recognized net actuarial gain

​

​

(0.4)

​

​

(0.4)

Net periodic benefit income

​

$

(0.8)

​

$

(0.8)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

For the year ended December 31, 

​

    

2023

    

2022

    

2021

​

​

(in millions)

Interest cost

​

$

2.8

​

$

1.9

​

$

1.8

Expected return on plan assets

​

​

(3.5)

​

​

(3.8)

​

​

(3.5)

Recognized net actuarial gain

​

​

(0.7)

​

​

(0.8)

​

​

(0.4)

Net periodic benefit income

​

$

(1.4)

​

$

(2.7)

​

$

(2.1)

​

Fair Value of Plan Assets (Table)  

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 2023

​

​

​

Assets

​

Fair value hierarchy level

​

​

​

measured at

​

​

​

​

    

fair value

    

Level 1

    

Level 2

    

Level 3

​

​

​

(in millions)

​

Asset category

​

​

​

​

​

​

​

​

​

​

​

​

​

Cash and cash equivalents

​

$

1.1

​

$

1.1

​

$

—

​

$

—

​

Fixed income security portfolios (1)

​

​

34.9

​

​

34.9

​

​

—

​

​

—

​

U.S. equity portfolios (2)

​

 

27.6

​

 

27.6

​

 

—

​

 

—

​

International equity portfolios (3)

​

 

10.4

​

 

10.4

​

 

—

​

 

—

​

Total

​

$

74.0

​

$

74.0

​

$

—

​

$

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

December 31, 2022

 

​

​

Assets

​

Fair value hierarchy level

 

​

​

measured at

​

​

 

​

    

fair value

    

Level 1

    

Level 2

    

Level 3

 

​

​

(in millions)

 

Asset category

​

​

​

​

​

​

​

​

​

​

​

​

​

Cash and cash equivalents

​

$

0.5

​

$

0.5

​

$

—

​

$

—

​

Fixed income security portfolios (1)

​

​

34.7

​

​

34.7

​

​

—

​

​

—

​

U.S. equity portfolios (2)

​

​

25.6

​

​

25.6

​

​

—

​

​

—

​

International equity portfolios (3)

​

 

9.6

​

 

9.6

​

 

—

​

 

—

​

Total

​

$

70.4

​

$

70.4

​

$

—

​

$

—

​

(1)The portfolios invest in various fixed income securities, primarily of U.S. origin. These include, but are not limited to, corporate bonds, residential mortgage-backed securities, commercial mortgage-backed securities, U.S. Treasury securities, agency securities, asset-backed securities and collateralized mortgage obligations.
(2)The portfolios invest primarily in publicly traded equity securities of large U.S. companies.
(3)The portfolios invest primarily in publicly traded equity securities of non-U.S. companies.
Target Asset Allocation (Table)  

​

​

​

​

​

Asset category

    

Target allocation

​

Fixed income security portfolios

​

50

%

U.S. equity portfolios

​

35

%

International equity portfolios

​

15

%