Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Deferred income	$ 73.8	$ 81.6
Accrued development costs	54.1	55.4
Accrued litigation settlement	38.7	38.5
Insurance claims and expenses	32.0	36.4
Operating lease liabilities	$ 17.2	$ 15.8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other postretirement benefits	$ 10.2	$ 10.2
Employee benefits	5.9	6.1
Reserve for uncertain tax positions	4.8	3.5
Other	7.0	10.0
Total	$ 243.7	$ 257.5