Leases - Additional Information (Detail) $ in Millions		9 Months Ended
		Sep. 30, 2021 USD ($) Lease	Dec. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
Gain from sale leaseback transaction		$ 107.7
Right of use assets		204.7	$ 108.3
Lease liabilities	[1],[2]	202.0
Significant Sale Lease Back Transaction [Member]
Lessee Lease Description [Line Items]
Net Proceeds From Sale Leaseback Transaction		$ 104.0
Percentage Increase of Amount		1.50%
Sale And Leased Back Annual Rent Payments Next Twelve Months		$ 6.4
Sale Leaseback Transaction Lease Term		15 years
Sale Leaseback Transaction Number Of Renewal Options | Lease		2
Sale leaseback transaction, renewal term		5 years
Gain from sale leaseback transaction		$ 62.5
Right of use assets		84.4
Lease liabilities		$ 84.4
Maximum [Member]
Lessee Lease Description [Line Items]
Noncancelable operating leases expire period		2036
Finance leases expire period		2027

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

[2] 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.