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Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Operating lease right-of-use assets	$ 40.1	$ 32.4
Current portion of operating lease liabilities	11.3	10.6
Operating lease liabilities, net of current portion	28.9	21.9
Total operating lease liabilities	40.2	32.5
Finance leases
Property, plant and equipment at cost	464.5	429.5
Accumulated depreciation	(253.7)	(230.8)
Property, plant and equipment, Net	210.8	198.7
Total finance lease liabilities	$ 0.6	$ 1.5
Weighted average remaining lease term
Operating leases	4 years 1 month 6 days	3 years 3 months 18 days
Finance leases	1 year 1 month 6 days	1 year 8 months 12 days
Weighted average discount rate
Operating leases	3.00%	3.10%
Finance leases	2.60%	2.40%
Financial Leases [Member]
Finance leases
Property, plant and equipment at cost	$ 9.0	$ 9.9
Accumulated depreciation	(8.0)	(8.1)
Property, plant and equipment, Net	1.0	1.8
Current portion of finance leases	0.5	1.0
Finance leases, net of current portion	0.1	0.5
Total finance lease liabilities	$ 0.6	$ 1.5

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