Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jan. 01, 2022	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Amortization expense for the deferred costs	$ 12.8	$ 11.3	$ 25.4	$ 22.3
Decrease in additional paid-in capital	2,869.9		2,869.9			$ 2,860.0
Decrease to accumulated deficit	$ (346.4)		$ (346.4)			(309.2)
ASU 2020-06 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2022		Jan. 01, 2022
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true		true
ASU 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Significant Accounting Policies [Line Items]
Increase in long-term debt					$ 92.9
Decrease in additional paid-in capital					(77.7)
Allocated issuance costs					2.7
Deferred tax impact					28.2
Decrease to accumulated deficit					$ (10.0)
Other Assets [Member]
Significant Accounting Policies [Line Items]
Deferred costs	$ 141.6		$ 141.6			$ 144.5