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Supplemental Cash Flow Disclosures (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Supplemental Cash Flow Information [Abstract] |  |  |
Royalties paid | $ 76.9 | $ 88.8 | $ 99.9
Income and mining taxes paid | 118.4 | 105.3 | 298.2
Interest paid after capitalization | $ 70.2 | $ 79.6 | $ 71.1

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