Summary of Significant Accounting Policies - Summary of Asset Balances and Related Amortization Expense For Contract Costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Costs to Obtain a Contract [Member]
Capitalized Contract Cost [Line Items]
Beginning Balance	$ 378.5	$ 325.5
Capitalization of Costs	111.5	107.8
Amortization	(64.3)	(54.8)
Ending Balance	425.7	378.5
Costs to Fulfill a Contract [Member]
Capitalized Contract Cost [Line Items]
Beginning Balance	420.0	338.9
Capitalization of Costs	144.0	133.7
Amortization	(65.7)	(52.6)
Ending Balance	$ 498.3	$ 420.0