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Leases - Maturities of Lease Liabilities (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Operating Lease Liabilities, Payments Due [Abstract]  
Within one year $ 11.4
Year two 9.2
Year three 8.1
Year four 4.7
Year five 3.6
Thereafter 3.7
Total lease payments 40.7
Less imputed interest (3.3)
Total operating lease liabilities 37.4
Finance Lease Liabilities, Payments, Due [Abstract]  
Within one year 1.5
Year two 0.8
Year three 0.3
Year four 0.1
Year five 0.0
Thereafter 0.0
Total lease payments 2.7
Less imputed interest (0.1)
Total finance lease liabilities $ 2.6