Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Gross carrying amount of amortizable intangible assets	$ 120.9		$ 120.9		$ 108.7
Accumulated amortization	58.4		58.4		53.3
Amortization expense	2.4	$ 3.0	5.1	$ 5.8
Gross carrying amount of property and equipment	23.6		23.6		17.4
Accumulated amortization	7.8		7.8		8.2
Depreciation expense	0.6	$ 0.6	1.3	$ 1.1
Hawaii Reporting Unit
Summary Of Significant Accounting Policies [Line Items]
Goodwill	$ 39.0		$ 39.0		$ 39.0