Segment Information - Schedule of Goodwill and Intangible Assets Net of Accumulated Amortization (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Goodwill	$ 147.3	$ 147.3
Intangible Assets, Net of Accumulated Amortization	17.3	60.5
U.S. Operations
Segment Reporting Information [Line Items]
Goodwill	118.6	118.6
Intangible Assets, Net of Accumulated Amortization	0.0	0.0
International Operations
Segment Reporting Information [Line Items]
Goodwill	28.7	28.7
Intangible Assets, Net of Accumulated Amortization	$ 17.3	$ 60.5