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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Employee Benefit Plans [Abstract]  
Schedule of Weighted-Average Assumptions for Benefit Obligations Weighted-average assumptions for the projected benefit obligation follows:
 December 31,
2021		December 31,
2020
Discount rate2.5 %2.1 %
Rate of compensation increase3.8 %3.8 %
Schedule of Weighted-Average Assumptions for Net Periodic Benefit Cost
Weighted-average assumptions for net periodic benefit cost follows:
 202120202019
Discount rate2.2 %3.0 %4.1 %
Rate of compensation increase3.8 %3.8 %3.8 %
Expected long-term return on plan assets6.6 %6.6 %6.3 %
Schedule of Reconciliation of the Change in the Projected Benefit Obligation, Plan Assets and the Funded
A reconciliation of the change in the projected benefit obligation, plan assets and the funded status follows: 
(in millions)20212020
Funded status  
Projected benefit obligation  
Balance as of January 1$186.4 $178.9 
Change in benefit obligation:  
Service cost3.0 3.0 
Interest cost2.8 4.5 
Actuarial (gains) loss(7.9)14.5 
Benefits paid(14.3)(14.5)
Balance as of December 31$170.0 $186.4 
Fair value of plan assets  
Balance as of January 1$162.4 $156.5 
Change in plan assets:  
Actual (loss) return on plan assets(0.4)18.9 
Company contributions1.5 1.5 
Benefits paid(14.3)(14.5)
Balance as of December 31$149.2 $162.4 
Unfunded status as of December 31$(20.8)$(24.0)
Accumulated benefit obligation as of December 31$169.7 $185.2 
Schedule of Net Asset (Liability)
(in millions)December 31,
2021		December 31,
2020
Long-term assets$0.5 $— 
Current liabilities(1.5)(1.5)
Long-term liabilities(19.8)(22.5)
Net pension liabilities$(20.8)$(24.0)
Schedule of Amounts Included in Accumulated Other Comprehensive Loss
The amounts included in accumulated other comprehensive income (loss) that have not been recognized in net periodic pension cost follows:
(in millions)December 31,
2021		December 31,
2020
Unrecognized actuarial losses (gross)$46.7 $52.4 
Unrecognized actuarial losses (net of tax)37.5 42.3 
Unrecognized prior service costs (gross)0.4 0.5 
Unrecognized prior service costs (net of tax)0.3 0.4 
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost follows:
(in millions)202120202019
Service cost$3.0 $3.0 $2.8 
Interest cost2.8 4.5 6.1 
Expected return on plan assets(9.7)(9.8)(9.7)
Amortization of unrecognized net loss6.2 5.1 3.1 
Amortization of unrecognized prior service credit0.1 0.2 0.2 
Settlement expense 1.7 — — 
Net periodic benefit cost$4.1 $3.0 $2.5 
Schedule of Fair Value of the Plans Assets by Asset Category
The fair value measurement of the plans’ assets by asset category follows:
 Quoted Prices in Active Markets for Identical Assets (Level 1)
(in millions)December 31,
2021		December 31,
2020
Cash$0.6 $0.6 
U.S. treasury bonds22.7 21.0 
Mutual funds:  
Equity mutual funds (1)
15.2 19.0 
Fixed income mutual funds (2)
110.7 121.8 
Total$149.2 $162.4 
(1)This category is comprised of investments in mutual funds that invest in equity securities such as large publicly traded companies listed in the S&P 500 Index; small to medium sized companies with market capitalization in the range of the Russell 2500 Index; and foreign issuers in emerging markets.
(2)This category is comprised of investments in mutual funds that invest in U.S. corporate fixed income securities, including asset-backed securities; high yield fixed income securities primarily rated BB, B, CCC, CC, C and D; and US dollar denominated debt securities of government, government related and corporate issuers in emerging market countries.
Summary of Estimated Future Benefits to Be Paid for the Company's Defined Benefit Pension Plans and Post-Retirement Medical Plan
A summary of estimated future benefits to be paid for the Company’s defined benefit pension plans as of December 31, 2021, follows:
(in millions)202220232024202520262027-2031
Estimated benefit payments$13.9 $13.6 $13.5 $13.7 $12.8 $57.0 
Schedule of Breakdown of Shares Held by ESOP Common shares held by the contribution savings plan follows:
(in millions)December 31,
2021		December 31,
2020		December 31,
2019
Common shares held0.7 0.8 0.9 
Summary of Receivable and Liability Related to Workers' Compensation Claims A summary of the receivable and liability related to workers' compensation claims follows:
(in millions)December 31,
2021		December 31,
2020
Other current assets$1.5 $— 
Other long-term assets3.8 4.9 
Total recovery receivable$5.3 $4.9 
Accrued and other current liabilities$2.4 $4.2 
Other long-term liabilities16.4 18.8 
Total workers' compensation liability$18.8 $23.0