v3.22.2.2
Retirement and Other Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of Net Periodic Benefit Cost
The following tables present the components of net periodic benefit cost for the Plans for the three and nine months ended September 30, 2022 and 2021: 
 Qualified Pension BenefitsUnfunded Non-qualified 
Pension Benefits		Retirement Health
Benefits
 For the Three Months Ended September 30,For the Three Months Ended September 30,For the Three Months Ended September 30,
 202220212022202120222021
Interest cost$4.1 $3.5 $0.3 $0.3 $— $0.1 
Expected return on plan assets(6.9)(6.8)— — (0.3)(0.4)
Amortization of prior service credit— — — — (3.4)(3.4)
Amortization of net loss (gain)0.8 1.2 0.5 0.8 (0.2)(0.2)
Settlement loss— — 1.8 0.3 — — 
Net periodic benefit cost$(2.0)$(2.1)$2.6 $1.4 $(3.9)$(3.9)
 Qualified Pension BenefitsUnfunded Nonqualified 
Pension Benefits		Retirement Health
Benefits
 For the Nine Months Ended September 30,For the Nine Months Ended September 30,For the Nine Months Ended September 30,
 202220212022202120222021
Interest cost$12.5 $10.5 $1.0 $0.9 $0.1 $0.1 
Expected return on plan assets(20.7)(20.6)— — (1.0)(1.2)
Amortization of prior service credit— — — — (10.2)(10.2)
Amortization of net loss (gain)2.3 3.6 1.6 2.4 (0.6)(0.4)
Settlement loss— — 1.8 0.3 — — 
Net periodic benefit cost$(5.9)$(6.5)$4.4 $3.6 $(11.7)$(11.7)