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Other noncurrent assets - Other assets (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Other noncurrent assets:
Note receivables - OPA	$ 74.2	$ 69.1
Operating lease right-of-use assets	22.0	22.7
Pension asset	19.9	8.1
Land held for development	15.2	19.4
IBNR receivables	13.4	13.4
Restricted cash and cash equivalents	5.8	32.4
Other	23.0	16.7
Total	$ 173.5	$ 181.8

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amortized cost, before allowance for credit loss, of financing receivable classified as noncurrent. Excludes net investment in lease.

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Estimated amount after valuation allowance of reinsurance recoverables, due from reinsurers for incurred claims not yet reported, and claims settlement expenses.

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Land held for development noncurrent.

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