Employee Benefits - Net Periodic Pension Expense (Detail) - USD ($) $ in Millions	6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted-Average Assumptions:
Expected Long-Term Rate of Return on Assets					7.25%
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost					$ 4.8	$ 5.6	$ 5.3
Interest Cost					5.3	3.9	3.7
Expected Return on Plan Assets					0.0	0.0	0.0
Amortization:
Net Actuarial Loss					5.3	7.4	8.2
Prior Service (Credit) Cost					0.0	0.0	0.1
Net Periodic Pension Expense					15.4	16.9	17.3
Settlement Expense					0.0	0.0	0.0
Total Pension Expense					$ 15.4	$ 16.9	$ 17.3
Weighted-Average Assumptions:
Discount Rates					5.15%	2.80%	2.45%
Rate of Increase in Compensation Level					5.56%	4.97%	4.97%
U.S. | Pension Plans, Defined Benefit
Defined Benefit plan Net periodic benefit cost
Service Cost					$ 46.0	$ 48.0	$ 52.3
Interest Cost					53.9	46.3	40.4
Expected Return on Plan Assets					(100.9)	(85.7)	(79.0)
Amortization:
Net Actuarial Loss					1.5	11.4	32.4
Prior Service (Credit) Cost					0.0	(0.1)	(0.4)
Net Periodic Pension Expense					0.5	19.9	45.7
Settlement Expense					0.0	44.1	27.9
Total Pension Expense					$ 0.5	$ 64.0	$ 73.6
Weighted-Average Assumptions:
Discount Rates	4.81%	3.05%	5.49%	3.06%	5.22%	5.22%	3.03%	2.75%
Rate of Increase in Compensation Level					5.56%	4.97%	4.97%
Expected Long-Term Rate of Return on Assets	6.00%	5.25%	6.50%	5.00%	7.25%		5.25%	5.25%
Non U.S. Plans | Pension Plans, Defined Benefit
Defined Benefit plan Net periodic benefit cost
Service Cost					$ 1.6	$ 1.7	$ 2.2
Interest Cost					4.8	2.5	2.2
Expected Return on Plan Assets					(6.7)	(3.2)	(3.2)
Amortization:
Net Actuarial Loss					(0.4)	0.6	1.0
Prior Service (Credit) Cost					0.0	0.0	0.2
Net Periodic Pension Expense					(0.7)	1.6	2.4
Settlement Expense					0.0	0.8	0.4
Total Pension Expense					$ (0.7)	$ 2.4	$ 2.8
Weighted-Average Assumptions:
Discount Rates					3.76%	1.34%	0.93%
Rate of Increase in Compensation Level					1.75%	1.50%	1.50%
Expected Long-Term Rate of Return on Assets					3.99%	1.79%	1.28%