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Defined Benefit and Postretirement Benefits (Components Of Net Periodic Cost) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1.3 $ 1.3
Interest cost 9.5 5.2
Expected return on plan assets (12.2) (13.9)
Amortization of prior service cost 0.0 0.0
Amortization of net (gain) loss 3.8 4.8
Settlement loss 1.8  
Recognized curtailment gain 1.1  
Net periodic cost 5.3 (2.6)
Postretirement    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.0 0.1
Interest cost 0.2 0.2
Expected return on plan assets 0.0 0.0
Amortization of prior service cost (0.2) (0.3)
Amortization of net (gain) loss (0.2) 0.0
Net periodic cost $ (0.2) $ 0.0