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Leases - Schedule of Supplemental Consolidated Balance Sheet Information Related to Leases (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Operating leases:    
Operating lease right-of-use assets $ 113.5 $ 0.0
Current operating lease liabilities 22.1 0.0
Operating lease liabilities 92.6 $ 0.0
Total operating lease liabilities $ 114.7  
Weighted average remaining lease term, in years 6 years 10 months 24 days  
Weighted average discount rate 7.70%