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Other Assets - Other Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Other noncurrent assets:
Land held for development	$ 95.5	$ 125.3
Operating lease right-of-use assets	26.8	29.0
Restricted cash and cash equivalents	33.8	33.0
IBNR receivables	32.6	8.5
Marketable securities	5.6	6.2
Pension asset	8.3	7.4
Note receivables - OPA	27.3	8.8
Other	8.1	11.9
Total	$ 238.0	$ 230.1

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