Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets with finite lives, Beginning balance	$ 77.8
Gross carrying amount	(0.1)
Intangible assets with finite lives, Ending balance	77.7
Intangible assets with finite lives, Accumulated amortization, Beginning balance	(75.3)
Intangible assets with finite lives, Accumulated amortization, Ending balance	(76.3)
Gross carrying amount, Amortization	0.0
Accumulated amortization	(1.0)
Net intangible assets with finite lives, Beginning balance	2.5
Amortization, intangible assets	(1.0)
Foreign Currency Translation Adjustments And Other Accumulated Amortization	0.0
Foreign Currency Translation Adjustments, Finite lived intangible assets	(0.1)
Net intangible assets with finite lives, Ending balance	1.4
Indefinite-lived Intangible Assets, Tradename and Other, Beginning Balance	300.3
Foreign Currency Translation Adjustments, Tradename and Other	(0.2)
Indefinite-lived Intangible Assets, Tradename and Other, Ending Balance	300.1
Total intangible assets - net, Beginning balance	302.8
Tradename and other, Amortization	0.0
Amortization, Total intangible assets net	(1.0)
Foreign Currency Translation Adjustments, Total intangible assets - net	(0.3)
Total intangible assets - net, Ending balance	$ 301.5