Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions		Sep. 30, 2023		Dec. 31, 2022
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in NCMI	[1]	$ 0.0
Fair Value Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in NCMI	[1]	19.6
Interest rate swap assets	[2]	17.3		$ 20.4
Fair Value Measurements, Recurring | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap assets		19.6	[1]	0.0	[2]
Fair Value Measurements, Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap assets	[2]	17.3		20.4
Fair Value Measurements, Recurring | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap assets	[2]	$ 0.0		$ 0.0

[1] See further discussion of investment in NCMI at Note 8.

[2] See further discussion of interest rate swaps at Note 7.