Employee Benefits - Summary of Total Expense (Benefit) Related to All Postretirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Net periodic postretirement benefit cost relating to defined benefit plans	$ 1.9	$ 1.5	$ 3.9	$ 2.9
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	4.3	4.0	10.1	9.7
Deferred compensation arrangement with individual, compensation expense	0.4	(0.5)	0.6	(0.8)
Multiemployer plan, contributions by employer	1.4	1.4	2.8	2.6
Net periodic postretirement benefit cost relating to defined benefit plans	3.3	3.3	6.4	6.5
Total other employee benefit plans	$ 9.4	$ 8.2	$ 19.9	$ 18.0