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Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Plan | UNITED STATES        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service Cost $ 2.3 $ 2.3 $ 7.0 $ 6.9
Interest Cost 21.4 20.7 64.2 62.1
Expected Return on Plan Assets (21.8) (22.8) (65.4) (68.4)
Amortization of Net Actuarial (Gain) Loss 3.8 3.7 11.2 11.0
Amortization of Prior Service Credit 0.0 0.0 0.0 0.0
Net Periodic Benefit Cost (Credit) 5.7 3.9 17.0 11.6
Pension Plan | UNITED KINGDOM        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service Cost 0.0 0.0 0.0 0.0
Interest Cost 2.2 1.9 6.5 5.7
Expected Return on Plan Assets (2.2) (2.1) (6.6) (6.3)
Amortization of Net Actuarial (Gain) Loss 0.7 0.7 2.1 2.2
Amortization of Prior Service Credit 0.0 0.0 0.0 0.0
Net Periodic Benefit Cost (Credit) 0.7 0.5 2.0 1.6
Other Postretirement Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans        
Service Cost 0.0 0.0 0.0 0.0
Interest Cost 1.0 1.0 3.0 3.0
Expected Return on Plan Assets (0.1) (0.1) (0.3) (0.3)
Amortization of Net Actuarial (Gain) Loss (0.3) (0.2) (0.9) (0.8)
Amortization of Prior Service Credit (0.1) (0.1) (0.2) (0.2)
Net Periodic Benefit Cost (Credit) $ 0.5 $ 0.6 $ 1.6 $ 1.7