XML 123 R103.htm IDEA: XBRL DOCUMENT v3.22.0.1
EMPLOYEE BENEFIT PLANS (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 57.5 $ 59.0 $ 43.6
Interest cost 5.3 6.9 8.3
Expected return on plan assets (14.2) (12.5) (9.6)
Amortization of prior service cost and actuarial loss 0.1 0.3 0.3
Net periodic benefit cost 48.7 53.7 42.6
Post-Retirement Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1.1 1.0 1.0
Interest cost 0.3 0.4 0.7
Expected return on plan assets 0.0 0.0 0.0
Amortization of prior service cost and actuarial loss 0.7 0.6 0.5
Net periodic benefit cost $ 2.1 $ 2.0 $ 2.2