Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Deferred income	$ 56.7	$ 81.6
Accrued development costs	53.5	55.4
Accrued litigation settlement	38.9	38.5
Insurance claims and expenses	32.2	36.4
Operating lease liabilities	$ 15.5	$ 15.8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other postretirement benefits	$ 9.9	$ 10.2
Employee benefits	5.4	6.1
Reserve for uncertain tax positions	4.9	3.5
Other	6.5	10.0
Total	$ 223.5	$ 257.5