Employee Benefits - Summary of Total Expense Related to All Postretirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 13.9	$ 8.3	$ 8.8
Deferred compensation arrangement with individual, compensation expense	0.7	1.5	1.6
Multiemployer plan, contributions by employer	5.0	4.9	5.0
Total net periodic postretirement benefit cost	4.1	4.7	6.5
Total other employee benefit plans	29.0	19.9	22.4
Postretirement Health Coverage | Salaried VEBA
Defined Benefit Plan Disclosure [Line Items]
Total net periodic postretirement benefit cost	2.3	4.8	6.6
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total net periodic postretirement benefit cost	4.3	$ 0.4	$ 0.4
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Total net periodic postretirement benefit cost	$ 2.8