Investment in Affiliates and Other Assets - Investment in Affiliates and Other Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Noncurrent Assets [Line Items]
Investment in affiliates	$ 77.8	$ 89.0
Other assets:
Land held for development	164.6us-gaap_RealEstateInvestmentPropertyNet	165.1us-gaap_RealEstateInvestmentPropertyNet
Restricted cash	15.2	13.9
Deferred financing costs	6.4	6.9
IBNR receivables	6.9	6.8
Capital lease deposit	6.2us-gaap_DepositAssets	6.2us-gaap_DepositAssets
Intangible assets	5.1	5.1
Other	26.4	25.7
Total	282.5us-gaap_OtherAssetsNoncurrent	282.9us-gaap_OtherAssetsNoncurrent
Capitalized Operating Permits
Other assets:
Waste disposal site operating permits, net	51.7	53.2
LPC
Other Noncurrent Assets [Line Items]
Investment in affiliates	$ 77.8	$ 89.0

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Net amount of long-term deferred finance costs capitalized at the end of the reporting period.

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The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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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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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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