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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Supplemental Financial Information [Abstract]    
Intangible assets $ 5.4 $ 49.0
Unbilled reimbursable receivables 1.7 18.6
Prepaid taxes on intercompany transfers of property 37.1 39.7
Supplemental executive retirement plan assets 33.1 43.2
Contracts Receivable, Claims and Uncertain Amounts 0.0 30.6
Deferred mobilization costs 82.3 82.3
Deferred tax assets 94.8 63.1
Other 9.7 12.4
Other assets, net $ 264.1 $ 338.9