Long-term Debt - Schedule of Floating Rate Loan Stock, Notes Outstanding (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Amount	$ 57.0	$ 60.7
Floating Rate Loan Stock, U.S. Dollar, Start Year 2004
Debt Instrument [Line Items]
Interest rate	4.35%	4.54%
Amount	$ 6.5	$ 6.5
Floating Rate Loan Stock, U.S. Dollar, Start Year 2006
Debt Instrument [Line Items]
Interest rate	4.15%	4.34%
Amount	$ 10.0	$ 10.0
Floating Rate Loan Stock, U.S. Dollar
Debt Instrument [Line Items]
Amount	$ 16.5	$ 16.5
Floating Rate Loan Stock, Euro, Start Year 2005
Debt Instrument [Line Items]
Interest rate	3.44%	3.47%
Amount	$ 13.5	$ 14.7
Floating Rate Loan Stock, Euro, Start Year 2006
Debt Instrument [Line Items]
Interest rate	3.44%	3.47%
Amount	$ 11.8	$ 12.9
Floating Rate Loan Stock, Euro, Start Year 2007
Debt Instrument [Line Items]
Interest rate	3.30%	3.36%
Amount	$ 15.2	$ 16.6
Floating Rate Loan Stock, Euro
Debt Instrument [Line Items]
Amount	$ 40.5	$ 44.2
London Interbank Offered Rate (LIBOR) | Floating Rate Loan Stock, U.S. Dollar, Start Year 2004
Debt Instrument [Line Items]
Interest rate basis spread	4.20%	4.20%
London Interbank Offered Rate (LIBOR) | Floating Rate Loan Stock, U.S. Dollar, Start Year 2006
Debt Instrument [Line Items]
Interest rate basis spread	4.00%	4.00%
Euribor | Floating Rate Loan Stock, Euro, Start Year 2005
Debt Instrument [Line Items]
Interest rate basis spread	4.00%	4.00%
Euribor | Floating Rate Loan Stock, Euro, Start Year 2006
Debt Instrument [Line Items]
Interest rate basis spread	4.00%	4.00%
Euribor | Floating Rate Loan Stock, Euro, Start Year 2007
Debt Instrument [Line Items]
Interest rate basis spread	3.90%	3.90%