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Supplemental Financial Information (Other Current Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Supplemental Financial Information [Abstract]    
Inventory $ 215.9 $ 207.8
Prepaid taxes 60.9 62.2
Short-term investments 50.0 50.0
Deferred mobilization costs 29.6 33.7
Deferred tax assets 21.2 14.6
Prepaid expenses 14.5 20.3
Assets Held-for-sale, Current 0 14.2
Other 21.9 22.6
Other current assets $ 414.0 $ 425.4