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Other Noncurrent Assets - Other Noncurrent Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other noncurrent assets: |  |
Land held for development | $ 157.4 | $ 157.2
Restricted cash | 20.9 | 19.6
IBNR receivables | 7.1 | 7.0
Capital lease deposit | 6.2 | 6.2
Intangible assets |  | 5.1
Pension asset | 1.9 | 1.7
Other | 11.7 | 11.8
Total | 252.4 | 256.7
Capitalized Operating Permits |  |
Other noncurrent assets: |  |
Waste disposal site operating permits, net | $ 47.2 | $ 48.1

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