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Other noncurrent liabilities - Other Noncurrent Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Schedule Of Other Liabilities [Line Items] |  |
Reserve for uncertain tax positions | $ 29.0 | $ 26.9
Asset retirement obligations | 10.1 | 3.9
Insurance claims and expenses | 10.0 | 9.7
Employee benefits | 9.9 | 10.3
Deferred income | 1.0 | 1.1
Other | 3.0 | 3.5
Total | $ 63.0 | $ 55.4

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