Employee Benefits - Summary of Total Expense Related to All Postretirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Net periodic postretirement benefit cost relating to defined benefit plans	$ 1.5	$ 2.2	$ 3.3	$ 6.1
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	4.4	4.3	14.4	14.4
Deferred compensation arrangement with individual, compensation expense	0.5		1.2	0.6
Multiemployer plan, contributions by employer	1.6	1.4	4.6	4.2
Net periodic postretirement benefit cost relating to defined benefit plans	2.5	3.3	6.8	9.7
Total other employee benefit plans	$ 9.0	$ 9.0	$ 27.0	$ 28.9