Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans
Settlement Loss on the U.S. Pension Plan Annuity Purchase	$ 103.8	$ 0.0	$ 0.0
Pension Plan | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	9.4	9.2	9.2
Interest Cost	85.5	82.9	87.9
Expected Return on Plan Assets	(87.2)	(91.3)	(92.0)
Amortization of Net Actuarial Loss (Gain)	14.9	14.6	15.2
Amortization of Prior Service Cost (Credit)	0.0	0.1	0.0
Settlement Loss on the U.S. Pension Plan Annuity Purchase	103.8	0.0	0.0
Total Net Periodic Benefit Cost (Credit)	126.4	15.5	20.3
Pension Plan | Foreign Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	0.0	0.0	0.0
Interest Cost	8.6	7.6	7.7
Expected Return on Plan Assets	(8.8)	(8.4)	(8.5)
Amortization of Net Actuarial Loss (Gain)	2.9	2.9	2.5
Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0
Settlement Loss on the U.S. Pension Plan Annuity Purchase	0.0	0.0	0.0
Total Net Periodic Benefit Cost (Credit)	2.7	2.1	1.7
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	0.0	0.0	0.0
Interest Cost	4.0	4.0	4.5
Expected Return on Plan Assets	(0.3)	(0.4)	(0.5)
Amortization of Net Actuarial Loss (Gain)	(1.2)	(1.1)	(10.5)
Amortization of Prior Service Cost (Credit)	(0.3)	(0.2)	(0.2)
Settlement Loss on the U.S. Pension Plan Annuity Purchase	0.0	0.0	0.0
Total Net Periodic Benefit Cost (Credit)	$ 2.2	$ 2.3	$ (6.7)