Employee Benefits - Summary of Components of Net Periodic Postretirement Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Net periodic postretirement benefit cost	$ 5.6	$ 4.1	$ 4.7
Salaried VEBA
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1
Interest cost	1.9	1.5
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.8	4.1	0.3
Interest cost	0.6	0.5	0.3
Expected return on plan assets	$ (0.9)	$ (0.4)	$ (0.3)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Amortization of net actuarial loss		$ 0.1	$ 0.1
Net periodic postretirement benefit cost	$ 5.5	4.3	0.4
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.6	1.1
Interest cost	2.2	1.7
Net periodic postretirement benefit cost	3.8	2.8
Postretirement Health Coverage | Salaried VEBA
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.1
Interest cost	1.9	1.5	2.5
Expected return on plan assets	(3.1)	(3.1)	(2.8)
Amortization of prior service cost	$ 4.9	$ 3.5	$ 4.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Amortization of net actuarial loss		$ 0.3	$ 0.3
Net periodic postretirement benefit cost	$ 3.8	$ 2.3	$ 4.8