Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest costs	$ 2.6	$ 1.5	$ 5.1	$ 3.0
Amortization of net actuarial loss	0.6	1.4	1.1	2.9
Amortization of prior service cost	0.0	0.1	0.0	0.2
Net periodic costs	$ 3.2	$ 3.0	$ 6.2	$ 6.1