Leases - Schedule of Maturity Analysis of Lease Liabilities (Detail) $ in Millions	Sep. 30, 2021 USD ($)
Operating Leases
2021	$ 8.2	[1]
2022	30.7	[1]
2023	26.9	[1]
2024	24.6	[1]
2025	20.8	[1]
After 2025	127.6	[1]
Total lease payments	238.8	[1]
Less: Interest	(36.8)	[1],[2]
Present value of lease liabilities	202.0	[1],[3]
Finance Leases
2021	3.0
2022	12.7
2023	6.1
2024	5.2
2025	2.7
After 2025	1.6
Total lease payments	31.3
Less: Interest	(1.6)	[2]
Present value of lease liabilities	$ 29.7	[3]

[1] There were no operating leases with options to extend lease terms that are reasonably certain of being exercised, and the lease payments excluded an estimated amount of $64.2 million of legally binding lease payments for leases signed but not yet commenced.

[2] Calculated using the discount rate for each lease.

[3] Includes the current portion of $25.4 million for operating leases and $13.2 million for finance leases.