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Leases - Maturities of Lease Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]    
Within one year $ 11.0 $ 6.5
Year two 9.0 4.5
Year three 6.4 3.2
Year four 4.5 2.3
Year five 2.4 2.1
Thereafter 2.7 4.4
Total lease payments 36.0 23.0
Less imputed interest (2.2)  
Total operating lease liabilities 33.8  
Finance Lease Liabilities, Payments, Due [Abstract]    
Within one year 1.2 1.8
Year two 0.6 1.0
Year three 0.2 0.4
Year four 0.0 0.1
Year five 0.0 0.0
Thereafter 0.0 0.0
Total lease payments 2.0 $ 3.3
Less imputed interest (0.2)  
Total finance lease liabilities $ 1.8