Leases - Schedule of Lease Assets and Liabilities Included on Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases:
Operating lease right-of-use assets	$ 40.9	$ 37.6
Current maturities of operating lease right-of-use assets	9.7
Operating lease right-of-use liabilities, less current maturities	31.6
Total operating lease liabilities	41.3	$ 38.0
Finance Leases:
Gross property, plant and equipment	10.6
Accumulated depreciation	(5.2)
Property, plant and equipment, net	$ 5.4
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Current maturities of long-term lease liabilities	$ 1.4
Long-term lease liabilities, less current maturities	2.8
Total finance lease liabilities	$ 4.2		$ 4.9