Leases - Schedule of Lease Assets and Liabilities Included on Condensed Consolidated Balance Sheet (Detail) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases:
Operating lease right-of-use assets	$ 35.2
Current maturities of operating lease right-of-use assets	9.1
Operating lease right-of-use liabilities, less current maturities	26.6
Total operating lease liabilities	35.7
Finance Leases:
Gross property, plant and equipment	9.7
Accumulated depreciation	(4.3)
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 debt	$ 1.4
Long-term debt, less current maturities	3.1
Total finance lease liabilities	$ 4.5