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Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Summary of Company's Plan Assets, Benefit Obligations, and Funded Status Assets, benefit obligations, and the funded status of the plans were determined at December 31, 2021 and 2020.
 Pension Benefits Medical and
Life Insurance
Benefits
 As of December 31,
 2021202020212020
 (In millions)
Change in fair value of assets:    
Fair value - beginning of year$957.0 $932.5 $— $— 
Gain on assets135.7 117.1 — — 
Employer contributions 18.8 15.6 2.4 2.8 
Benefits paid (1)(106.5)(108.2)(2.4)(2.8)
Fair value - end of year$1,005.0 $957.0 $— $— 
Change in benefit obligation:    
Benefit obligation - beginning of year$1,381.5 $1,349.8 $25.0 $25.9 
Interest cost33.5 42.5 0.5 0.8 
Actuarial (gains) losses(29.2)97.4 (3.5)1.1 
Benefits paid(106.5)(108.2)(2.4)(2.8)
Benefit obligation and accumulated benefit obligation - end of year$1,279.3 $1,381.5 $19.6 $25.0 
Funded status of the plans$(274.3)$(424.5)$(19.6)$(25.0)
Amounts recognized in the consolidated balance sheets:    
Postretirement medical and life insurance benefits, current$— $— $(2.7)$(3.5)
Postretirement medical and life insurance benefits, noncurrent— — (16.9)(21.5)
Pension liability, non-qualified current (component of other current liabilities)(1.4)(1.3)— — 
Pension liability, non-qualified (component of other noncurrent liabilities)(17.0)(18.0)— — 
Pension benefits, noncurrent (255.9)(405.2)— — 
Net liability recognized in the consolidated balance sheets$(274.3)$(424.5)$(19.6)$(25.0)
______
(1)Benefits paid for medical and life insurance benefits are net of the Medicare Part D Subsidy of less than $0.1 million, and $0.1 million received in 2021 and 2020, respectively.
Summary of Components of Retirement Benefit Expense (Income)
The following table presents the components of retirement benefits expense (income): 
 Pension BenefitsMedical and
Life Insurance Benefits 
 Year Ended December 31, Year Ended December 31,
 202120202019202120202019
 (In millions)
Interest cost on benefit obligation$33.5 $42.5 $52.7 $0.5 $0.8 $1.2 
Assumed return on assets(61.4)(60.5)(64.8)— — — 
Amortization of prior service costs (credits)0.1 0.1 0.1 — — (0.2)
Amortization of net losses (gains)63.9 57.4 40.9 (2.7)(3.7)(3.8)
$36.1 $39.5 $28.9 $(2.2)$(2.9)$(2.8)
The following table presents the actual return and rate of return on assets:
 Year Ended December 31,
 202120202019
 (In millions, except rate of return)
Actual gain on assets$135.7 $117.1 $144.8 
Actual rate of return on assets15.0 %15.6 %18.0 %
Schedule of Assumptions Used to Determine Benefit Obligations
The following table presents the assumptions, calculated based on a weighted-average, to determine the benefit obligations:
 
Pension
Benefits
Medical and
Life Insurance Benefits
As of December 31,As of December 31,
 
2021
2020
2021
2020
Discount rate2.90 %2.52 %2.77 %2.28 %
Discount rate (non-qualified plan)2.89 %2.51 %**
Ultimate healthcare trend rate**4.50 %4.50 %
Initial healthcare trend rate (pre 65/post 65)**6.25 %6.50 %
Year ultimate rate attained (pre 65/post 65)**20292028
______
*    Not applicable
Schedule of Assumptions Used to Determine Periodic Benefit Expense (Income)
The following table presents the assumptions, calculated based on a weighted-average, to determine the retirement benefits expense (income):
 Pension BenefitsMedical and
Life Insurance Benefits 
Year Ended December 31,Year Ended December 31,
 202120202019202120202019
Discount rate2.52 %3.28 %4.27 %2.28 %3.19 %4.09 %
Discount rate (non-qualified plan)2.51 %3.30 %4.27 %***
Expected long-term rate of return on assets7.00 %7.00 %7.00 %***
Ultimate healthcare trend rate***4.50 %4.50 %4.50 %
Initial healthcare trend rate (pre 65/post 65)***6.50 %5.50 %6.00 %
Year ultimate rate attained (pre 65/post 65)***202820222022
______
*    Not applicable
Schedule of Pension Plan's Asset Allocations by Asset Category The following table presents the asset allocations by asset category:
As of December 31,
20212020
Cash and cash equivalents5 %2 %
Equity securities47 46 
Fixed income12 15 
Registered investment companies1 2 
Private assets10 11 
Hedge funds25 24 
Total100 %100 %
Schedule of Fair Value of Pension Plan Assets and Liabilities by Asset Category and by Level
The following tables present the fair value by asset category and by level:
 TotalQuoted Prices in Active Markets for Identical Assets (Level 1)Other Observable Inputs (Level 2)Unobservable Inputs (Level 3)
(In millions)
December 31, 2021
Cash and cash equivalents$0.1 $0.1 $— $— 
Equity securities:    
  Domestic equity securities428.5 428.5 — — 
  International equity securities44.2 44.2 — — 
Fixed income:    
  Corporate debt securities57.5 — 39.9 17.6 
  Asset-backed securities29.3 — 29.3 — 
  U.S. government securities28.8 — 28.8 — 
  Foreign bonds0.9 — 0.9 — 
  Derivatives0.1 — 0.1 — 
Registered investment companies13.9 13.9 — — 
Private assets1.2 — — 1.2 
Total 604.5 $486.7 $99.0 $18.8 
Investment measured at Net Asset Value ("NAV")
  Private assets97.8 
  Hedge funds254.5 
Common/collective trusts ("CCTs")56.4 
Total investments measured at NAV408.7 
Receivables9.5 
Payables(17.7)
Total assets$1,005.0 
 TotalQuoted Prices in Active Markets for Identical Assets (Level 1)Other Observable Inputs (Level 2)Unobservable Inputs (Level 3)
(In millions)
December 31, 2020
Cash and cash equivalents$0.4 $0.4 $— $— 
Equity securities:  
  Domestic equity securities406.3 400.2 — 6.1 
  International equity securities37.0 37.0 — — 
Fixed income:  
  Corporate debt securities71.5 — 39.6 31.9 
  Asset-backed securities28.7 — 28.7 — 
  U.S. government securities41.4 — 41.4 — 
  Municipal bonds0.6 — 0.6 — 
  Foreign bonds0.5 — 0.5 — 
Registered investment companies16.4 16.4 — — 
Private assets3.1 — — 3.1 
Total 605.9 $454.0 $110.8 $41.1 
Investment measured at NAV
  Private assets100.8 
  Hedge funds232.3 
CCTs 36.2 
Total investments measured at NAV369.3 
Receivables0.9 
Payables(19.1)
Total assets$957.0 
Schedule of Changes in Fair Value of Level 3 Investments
The following tables present the changes in the fair value of the Level 3 investments:
 December 31, 2020Unrealized
Gains (Losses)		Realized
Gains		Purchases, Sales, and
Settlements, net 		December 31,
2021
 (In millions)
Equity securities$6.1 $10.1 $1.1 $(17.3)$— 
Corporate debt securities31.9 0.1 — (14.4)17.6 
Private assets3.1 — — (1.9)1.2 
Total$41.1 $10.2 $1.1 $(33.6)$18.8 
 December 31, 2019Unrealized
Gains		Realized
Gains		Purchases, Sales, and
Settlements, net 		December 31,
2020
 (In millions)
Equity securities$4.2 $1.9 $— $— $6.1 
Corporate debt securities27.6 5.4 — (1.1)31.9 
Private assets5.4 1.7 1.3 (5.3)3.1 
Total$37.2 $9.0 $1.3 $(6.4)$41.1 
Schedule of Estimated Future Benefit Payments
The following table presents estimated future benefit payments:  
 
Pension
Benefit
Payments
Medical and Life Insurance Benefits
Year Ending December 31,
Gross Benefit Payments
Medicare D
Subsidy 
Net Benefit
Payments 
 (In millions)
2022$104.7 $2.8 $0.1 $2.7 
2023101.5 2.5 0.1 2.4 
202498.1 2.2 0.1 2.1 
202594.5 2.0 0.1 1.9 
202690.7 1.7 — 1.7 
Years 2027 - 2031395.1 6.1 0.1 6.0