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Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Operating Leases    
Operating lease right-of-use assets $ 33.8 $ 0.0
Current portion of operating lease liabilities 11.0 0.0
Operating lease liabilities, net of current portion 22.8 0.0
Total operating lease liabilities 33.8  
Finance leases    
Net property, plant and equipment, net 195.0 $ 196.4
Total finance lease liabilities $ 1.8  
Weighted average remaining lease term    
Operating leases 3 years 4 months 24 days  
Finance leases 1 year 9 months 18 days  
Weighted average discount rate    
Operating leases 3.10%  
Finance leases 2.40%  
Financial Leases [Member]    
Finance leases    
Property, plant and equipment at cost $ 10.5  
Accumulated depreciation (8.3)  
Net property, plant and equipment, net 2.2  
Current portion of finance leases 1.2  
Finance leases, net of current portion 0.6  
Total finance lease liabilities $ 1.8