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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Projected Benefit Obligation, Fair Value of Assets, Funded Status and the Amounts Not Yet Recognized As Components of Net Periodic Pension and Postretirement Benefits Cost
Projected Benefit Obligation, Fair Value of Assets and Funded Status

The projected benefit obligation, fair value of assets, funded status and the amounts not yet recognized as components of net periodic pension and postretirement benefits cost for the Retirement Plans and PBOP at December 31, 2021 and 2020, were as follows (in millions):
 Retirement PlansPBOP
 For the Year Ended
December 31,		For the Year Ended
December 31,
 2021202020212020
Change in benefit obligation:    
Benefit obligation at beginning of period$120.7 $122.2 $35.2 $36.5 
Service cost2.6 2.8 0.1 0.1 
Interest cost2.1 2.7 0.9 1.1 
Plan participants' contributions— — 1.1 1.1 
Actuarial (gain) loss(1.4)6.0 (2.6)(0.3)
Benefits paid(0.5)(0.5)(4.1)(3.3)
Settlements(14.4)(12.5)— — 
Benefit obligation at end of period$109.1 $120.7 $30.6 $35.2 
Change in plan assets:    
Fair value of plan assets at beginning of period$102.7 $101.7 $96.2 $90.8 
Actual return on plan assets10.5 10.4 (0.3)7.5 
Company's contribution5.2 3.6 0.1 0.1 
Plan participants' contributions— — 1.1 1.1 
Benefits paid(0.5)(0.5)(4.1)(3.3)
Settlements(14.4)(12.5)— — 
Fair value of plan assets at end of period$103.5 $102.7 $93.0 $96.2 
Funded status$(5.6)$(18.0)$62.4 $61.0 
Items not recognized as components of net periodic cost:   
Net actuarial loss (gain)$10.0 $18.2 $(2.9)$(3.4)
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets
At December 31, 2021 and 2020, the following aggregate information relates only to the underfunded plans (in millions):
Retirement Plans
 For the Year Ended
December 31,
 20212020
Projected benefit obligation$109.1 $120.7 
Accumulated benefit obligation103.4 113.7 
Fair value of plan assets103.5 102.7 
Schedule of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the years ended December 31, 2021, 2020 and 2019, were as follows (in millions):
 Retirement PlansPBOP
 For the Year Ended
December 31,		For the Year Ended
December 31,
 202120202019202120202019
Service cost$2.6 $2.8 $3.0 $0.1 $0.1 $0.1 
Interest cost2.1 2.7 3.9 0.9 1.1 1.4 
Expected return on plan assets(6.2)(6.3)(6.4)(2.7)(3.2)(3.0)
Amortization of unrecognized net loss0.8 1.9 2.2 — — — 
Settlement charge1.6 2.4 2.9 — — — 
Regulatory asset decrease2.5 — — — — — 
Net periodic benefit cost$3.4 $3.5 $5.6 $(1.7)$(2.0)$(1.5)
Schedule of Expected Benefit Payments
Estimated Future Benefit Payments

The following table shows benefit payments, which reflect expected future service, as appropriate, which are expected to be paid for both the Retirement Plans and PBOP (in millions):
 
Retirement Plans
PBOP
2022$21.8 $2.1 
202311.9 2.1 
202410.7 2.0 
202511.9 1.9 
202610.1 1.9 
2027-203134.5 7.5 
Weighted-Average Assumptions Used to Determine Benefit Obligations
Weighted-Average Assumptions

Weighted-average assumptions used to determine benefit obligations for the years ended December 31, 2021 and 2020, were as follows:
 Retirement PlansPBOP
For the Year Ended
December 31,		For the Year Ended
December 31,
 2021202020212020
 PensionSRPPensionSRP
Discount rate2.30 %2.35 %1.70 %1.55 %2.90 %2.60 %
Expected return on plan assets6.25 %6.25 %6.50 %6.50 %2.01 %2.81 %
Rate of compensation increase3.00 %3.00 %3.00 %3.00 %— — 
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
Weighted-average assumptions used to determine net periodic benefit cost for the periods indicated were as follows:
 Retirement PlansPBOP
 For the Year Ended
December 31,		For the Year Ended
December 31,
 202120202019202120202019
Pension
SRP
Pension
SRPPensionSRP
Discount rate(1)1.55 %(1)2.70 %(1)4.10 %2.60 %3.30 %4.30 %
Expected return on plan assets6.50%6.50 %7.00%7.00 %7.00%7.00 %2.81 %3.61 %3.61 %
Rate of compensation increase3.00%3.00 %3.00%3.00 %3.86%3.86 %— — — 
(1)Pension expense was remeasured quarterly in 2021, 2020 and 2019. The quarterly remeasurements for each quarter in 2021, 2020 and 2019 were as follows: Quarter 1: 2.05%, 2.95% and 3.80%; Quarter 2: 2.05%, 2.20% and 3.25%; Quarter 3: 1.95%, 1.85% and 2.60%; and Quarter 4: 2.30%, 1.70% and 2.70%.
Fair Values of Pension Plan Assets By Asset Class Master Trust
The following table sets forth, by level within the fair value hierarchy, a summary of the Master Trust's investments measured at fair value on a recurring basis at December 31, 2021 (in millions):
 Master Trust Assets
Measured under Fair Value HierarchyMeasured at Net Asset ValueTotal Master Trust Assets
 Level 1Level 2Level 3Total
Equity securities$69.1 $— $— $69.1 $— $69.1 
Short-term investments1.9 — — 1.9 — 1.9 
Other assets2.2 — — 2.2 — 2.2 
Fixed income mutual funds111.3 — — 111.3 — 111.3 
Total assets measured at fair
   value		184.5 — — 184.5 — 184.5 
Total limited partnerships
   measured at net asset value		— — — — 54.9 54.9 
Total$184.5 $— $— $184.5 $54.9 $239.4 

The following table sets forth, by level within the fair value hierarchy, a summary of the Master Trust's investments measured at fair value on a recurring basis at December 31, 2020 (in millions):
 Master Trust Assets
Measured under Fair Value HierarchyMeasured at Net Asset ValueTotal Master Trust Assets
 Level 1Level 2Level 3Total
Equity securities$59.9 $— $— $59.9 $— $59.9 
Short-term investments3.9 — — 3.9 — 3.9 
Fixed income mutual funds112.5 — — 112.5 — 112.5 
Total assets measured at fair
   value		176.3 — — 176.3 — 176.3 
Total limited partnerships
   measured at net asset value		— — — — 57.5 57.5 
Total$176.3 $— $— $176.3 $57.5 $233.8 
Fair Values of PBOP Plan Assets By Asset Class
The following table sets forth, by level within the fair value hierarchy, a summary of the PBOP trust investments measured at fair value on a recurring basis at December 31, 2021 (in millions):
 PBOP Trust Assets
 Level 1Level 2Level 3Total
Short-term investments$4.3 $— $— $4.3 
Fixed income mutual funds19.2 — — 19.2 
Asset-backed securities— 6.9 — 6.9 
Corporate bonds— 31.0 — 31.0 
Tax exempt securities— 31.6 — 31.6 
Total investments$23.5 $69.5 $— $93.0 


The following table sets forth, by level within the fair value hierarchy, a summary of the PBOP trust investments measured at fair value on a recurring basis at December 31, 2020 (in millions):
 PBOP Trust Assets
 Level 1Level 2Level 3Total
Short-term investments$5.7 $— $— $5.7 
Fixed income mutual funds19.5 — — 19.5 
Asset-backed securities— 14.4 — 14.4 
Corporate bonds— 23.7 — 23.7 
Tax exempt securities— 32.9 — 32.9 
Total investments$25.2 $71.0 $— $96.2