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Leases - Maturities of Lease Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Operating Lease Liabilities, Payments Due [Abstract]
Within one year	$ 14.3	$ 12.5
Year two	8.9	9.0
Year three	6.4	6.0
Year four	5.2	3.9
Year five	1.5	3.1
Thereafter	13.5	3.2
Total lease payments	49.8	37.7
Less imputed interest	(4.5)	(2.2)
Total operating lease liabilities	45.3	35.5
Finance Lease Liabilities, Payments, Due [Abstract]
Within one year		0.1
Year two		0.0
Year three		0.0
Year four		0.0
Year five		0.0
Thereafter		0.0
Total lease payments		0.1
Less imputed interest		0.0
Total finance lease liabilities	$ 0.0	$ 0.1

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