XML 122 R104.htm IDEA: XBRL DOCUMENT v3.25.0.1
Employee Benefit Plans (Principal Components of Employee Benefit Costs) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefits Cost (Reversal of Cost) $ 98.9 $ 73.6 $ 34.8
Savings Plan      
Employee Benefit Plan Disclosure [Line Items]      
Savings plan 60.5 34.5 37.3
Unfunded Supplemental Benefit Plans      
Employee Benefit Plan Disclosure [Line Items]      
Employee benefit plan expenses 12.0 12.3 12.2
Other Plans, Net      
Employee Benefit Plan Disclosure [Line Items]      
Other plans, net $ 26.4 $ 26.8 $ (14.7)