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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Supplemental Financial Information [Abstract] |  |
Inventory | $ 235.3 | $ 240.3
Prepaid taxes | 73.5 | 90.6
Deferred mobilization costs | 52.1 | 61.9
Prepaid expenses | 20.5 | 33.8
Assets held for sale | 5.5 | 152.4
Other | 14.9 | 6.6
Other current assets | $ 401.8 | $ 585.6

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