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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible assets with finite lives, Beginning balance | $ 77.7
Gross carrying amount | 0.0
Gross carrying amount, Amortization | 0.0
Intangible assets with finite lives, Ending balance | 77.7
Intangible assets with finite lives, Accumulated amortization, Beginning balance | (77.3)
Foreign Currency Translation Adjustments And Other Accumulated Amortization | 0.0
Intangible assets with finite lives, Accumulated amortization, Ending balance | (77.7)
Net intangible assets with finite lives, Beginning balance | 0.4
Amortization, intangible assets | (0.4)
Foreign Currency Translation Adjustments, Finite lived intangible assets | 0.0
Net intangible assets with finite lives, Ending balance | 0.0
Indefinite-lived Intangible Assets, Tradename and Other, Beginning Balance | 300.1
Tradename and other, Amortization | 0.0
Foreign Currency Translation Adjustments, Tradename and Other | 0.3
Indefinite-lived Intangible Assets, Tradename and Other, Ending Balance | 300.4
Total intangible assets - net, Beginning balance | 300.5
Amortization, Total intangible assets net | (0.4)
Foreign Currency Translation Adjustments, Total intangible assets - net | 0.3
Total intangible assets - net, Ending balance | $ 300.4

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