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Retirement Plans and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Summary of Contributions to Qualified Defined Contribution Plan, 401(k), Non-Qualified Defined Contribution Plan and Total Assets of the Plans
Plan contributions to employees' accounts under the 401(k) plan and the non-qualified defined contribution plan, as well as total assets of the plans, were as follows:
($ in millions)Year Ended December 31,
202220212020
401(k) plan
Contributions to employees' accounts
$9.4 $8.2 $8.2 
Total assets at the end of the year
207.1 246.9 228.4 
Non-qualified defined contribution plan
Contributions to employees' accounts
0.1 0.1 0.1 
Total assets at the end of the year
— — — 
Summary of Funded Status of the Defined Benefit, Supplemental Retirement Pension Plans and Postretirement Benefits Other than Pensions
The following tables summarize the funded status of the defined benefit and supplemental retirement pension plans as of December 31, 2022, 2021 and 2020 (the measurement dates) and identify (1) the assumptions used to determine the projected benefit obligation and (2) the components of net pension cost for the defined benefit plan and supplemental retirement plans for the following periods:
($ in millions)Defined Benefit PlanSupplemental
Defined Benefit Plans
December 31,December 31,
202220212020202220212020
Change in benefit obligation:
Projected benefit obligation
at beginning of year
$22.2 $24.3 $24.8 $14.5 $15.7 $15.2 
Service cost
0.7 0.6 0.7 — — — 
Interest cost
0.5 0.5 0.7 0.3 0.3 0.5 
Plan amendments
— — — — — — 
Actuarial loss (gain)
(3.7)(0.6)1.0 (2.1)(0.2)1.3 
Benefits paid
(2.5)(2.6)(1.5)(1.3)(1.3)(1.3)
Settlements
— — (1.4)— — — 
Projected benefit obligation at end of
year
$17.2 $22.2 $24.3 $11.4 $14.5 $15.7 
Change in plan assets:
Fair value of plan assets
at beginning of year
$19.8 $22.0 $23.2 $— $— $— 
Actual return on plan assets
(3.2)1.0 2.3 — — 
Employer contributions
— — — 1.3 1.3 1.3 
Benefits paid
(2.5)(2.6)(1.5)(1.3)(1.3)(1.3)
Expenses paid
(0.5)(0.6)(0.6)— — — 
Settlements
— (1.4)— — — 
Fair value of plan assets at end of year
$13.6 $19.8 $22.0 $— $— $— 
Funded status$(3.6)$(2.4)$(2.3)$(11.4)$(14.5)$(15.7)
Prepaid (accrued) benefit expense$4.1 $4.9 $5.5 $(8.1)$8.7 $(9.3)
Total amount recognized in Consolidated
Balance Sheets, all in Other liabilities
$(3.6)$(2.4)$(2.3)$(11.4)$(14.5)$(15.7)
Amounts recognized in accumulated other
comprehensive income (loss) (AOCI):
Prior service cost$— $— $— $— $— $— 
Net actuarial loss(7.9)(7.3)(7.8)(3.3)(6.5)(6.4)
Total amount recognized in AOCI$(7.9)$(7.3)$(7.8)$(3.3)$(6.5)$(6.4)
Information for pension plans with an
accumulated benefit obligation greater
than plan assets:
Projected benefit obligation$17.2 $22.2 $24.3 $11.4 $14.5 $15.7 
Accumulated benefit obligation17.2 22.2 24.3 11.4 14.5 15.7 
Fair value of plan assets13.6 19.8 22.0 — — — 
Schedule of Defined Benefit Plan and the Supplemental Defined Benefit Plans
($ in millions)Defined Benefit PlanSupplemental
Defined Benefit Plans
Year Ended December 31,Year Ended December 31,
202220212020202220212020
Components of net periodic pension
(income) expense:
Service cost:
Benefit accrual
$— $— $— $— $— $— 
Other expenses
0.7 0.6 0.7 — — — 
Interest cost
0.5 0.5 0.7 0.3 0.3 0.5 
Expected return on plan assets
(0.8)(0.9)(1.0)— — — 
Settlement loss
— — 0.5 — — — 
Amortization of:
Prior service cost
— — — — — — 
Actuarial loss
0.3 0.4 0.3 0.4 0.4 0.3 
Net periodic pension expense$0.7 $0.6 $1.2 $0.7 $0.7 $0.8 
Changes in plan assets and benefit
obligations included in other
comprehensive income (loss):
      
Prior service cost
$— $— $— $— $— $— 
Net actuarial loss (gain)
0.9 (0.2)0.3 (2.1)(0.2)1.3 
Amortization of:
Prior service cost
— — — — — — 
Actuarial loss
(0.3)(0.4)(0.8)(0.4)(0.4)(0.3)
Total recognized in
other comprehensive
income (loss)
$0.6 $(0.6)$(0.5)$(2.5)$(0.6)$1.0 
Weighted average assumptions used to
determine expense:
      
Discount rate
2.57 %2.08 %3.10 %2.57 %2.08 %3.10 %
Expected return on plan assets
4.80 %4.74 %4.80 %***
Annual rate of salary increase
******
Weighted average assumptions
used to determine benefit obligations
as of December 31:
      
Discount rate
5.39 %2.57 %2.08 %5.39 %2.57 %2.08 %
Expected return on plan assets
4.80 %4.74 %4.80 %**
Annual rate of salary increase
******

*Not applicable.
Schedule of Fair Value Hierarchy for the Company's Defined Benefit Pension Plan Assets The following table presents the fair value hierarchy for the Company's defined benefit pension plan assets, excluding cash held.
($ in millions)Fair Value Measurements at
Reporting Date Using
TotalLevel 1Level 2Level 3
December 31, 2022
Asset category
Equity security funds(1)
United States
$3.3 $— $3.3 $— 
International
3.3 — 3.3 — 
Fixed income funds
6.5 — 6.5 — 
Short-term investment funds
0.5 0.5 — — 
Total
$13.6 $0.5 $13.1 $— 
December 31, 2021
Asset category
Equity security funds(1)
United States
$3.8 $— $3.8 $— 
International
3.3 — 3.3 — 
Fixed income funds
12.4 — 12.4 — 
Short-term investments funds
0.3 0.3 — — 
Total
$19.8 $0.3 $19.5 $— 
(1)    None of the trust fund assets for the defined benefit pension plan have been invested in shares of HMEC's common stock.
Summary of Minimum Funding Requirement and the Expected Full Year Contributions for the Company's Plans The following table discloses that minimum funding requirement and the expected full year contributions for the Company's plans.
($ in millions)Defined Benefit Pension Plans
Defined
Benefit Plan		Supplemental
Defined Benefit Plans
Minimum funding requirement for 2022$— $— 
Expected contributions (approximations) for the year ended
December 31, 2023 at the time of issuance of this Form 10-K(1)
$— $1.3 
(1)    HMEC's Annual Report on Form 10-K for the year ended December 31, 2022.
Schedule of Estimated Future Benefit Payments Estimated future benefit payments as of December 31, 2022 were as follows:
($ in millions)202320242025202620272028-2032
Pension plans
Defined benefit plan
$2.1 $2.1 $2.0 $1.7 $1.6 $6.2 
Supplemental retirement plans
1.3 1.2 1.2 1.2 1.1 4.9