Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Accrued development costs	$ 51.9	$ 55.4
Deferred income	41.1	81.6
Accrued litigation settlement	27.3	38.5
Insurance claims and expenses	21.2	36.4
Operating lease liabilities	$ 16.2	$ 15.8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other postretirement benefits	$ 9.5	$ 10.2
Employee benefits	5.0	6.1
Reserve for uncertain tax positions	5.8	3.5
Other	6.2	10.0
Total	$ 184.2	$ 257.5