v2.3.0.15

Supplemental Financial Information (Other Assets, Net) (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Supplemental Financial Information [Abstract] |  |
Intangible assets | $ 203.5 |
Unbilled reimbursable receivables | 129.5 | 20.0
Prepaid taxes on intercompany transfers of property | 71.8 | 74.6
Deferred mobilization costs | 39.7 | 31.3
Wreckage and debris removal receivables | 24.8 | 26.8
Supplemental executive retirement plan assets | 24.2 | 23.0
Auction rate securities |  | 44.5
Other | 34.5 | 8.5
Other Assets, Net | $ 528.0 | $ 228.7

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