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Employee Benefits - Summary of Total Expense Related to All Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net periodic postretirement and postemployment benefit cost relating to defined benefit plans $ 1.2 $ 1.5 $ 3.8 $ 3.3
Postretirement and Postemployment Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, cost 4.2 4.4 14.8 14.4
Deferred compensation arrangement with individual, compensation expense 0.5 0.5 1.1 1.2
Multiemployer plan, contributions by employer 1.6 1.6 4.7 4.6
Net periodic postretirement and postemployment benefit cost relating to defined benefit plans 2.3 2.5 7.1 6.8
Total other employee benefit plans $ 8.6 $ 9.0 $ 27.7 $ 27.0