Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Operating Leased Assets [Line Items]
Right of use lease asset	$ 35.4	$ 27.9
Financing lease assets noncurrent	$ 9.2	$ 8.0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant, and equipment, net	Property, plant, and equipment, net
Total lease assets	$ 49.7	$ 43.5
Finance lease liability current	$ 1.3	$ 0.4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent	us-gaap:LongTermDebtCurrent
Operating lease liability current	$ 14.9	$ 10.5
Finance lease liability Noncurrent	$ 9.0	$ 8.4
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent
Operating lease liability noncurrent	$ 40.8	$ 33.6
Total lease liabilities	66.0	52.9
Trade And Other Receivables Net
Operating Leased Assets [Line Items]
Operating lease assets current	2.8	5.4
Prepaid Expenses and Other Current Assets
Operating Leased Assets [Line Items]
Operating lease assets current	$ 2.3	$ 2.2