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Leases - Maturities of Lease Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Lease Liabilities, Payments Due [Abstract] |  |
Within one year | $ 10.8 | $ 6.5
Year two | 9.1 | 4.5
Year three | 5.8 | 3.2
Year four | 4.4 | 2.3
Year five | 2.1 | 2.1
Thereafter | 2.5 | 4.4
Total lease payments | 34.7 | 23.0
Less imputed interest | (2.2) |
Total operating lease liabilities | 32.5 |
Finance Lease Liabilities, Payments, Due [Abstract] |  |
Within one year | 1.1 | 1.8
Year two | 0.4 | 1.0
Year three | 0.1 | 0.4
Year four | 0.0 | 0.1
Year five | 0.0 | 0.0
Thereafter | 0.0 | 0.0
Total lease payments | 1.6 | $ 3.3
Less imputed interest | (0.1) |
Total finance lease liabilities | $ 1.5 |

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