Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Accrued development costs	$ 45.8	$ 48.1
Deferred income	22.0	25.9
Long-term litigation settlement	27.6	27.4
Insurance claims and expenses	17.2	18.7
Operating lease liabilities	$ 17.2	$ 17.4
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other postretirement benefits	$ 7.0	$ 7.1
Employee benefits	4.9	4.8
Reserve for uncertain tax positions	0.3	0.3
Other	7.1	6.7
Total	$ 149.1	$ 156.4