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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Deferred tax assets $ 29.4 $ 38.8
Supplemental executive retirement plan assets 27.2 30.9
Deferred mobilization costs 21.5 37.4
Finite-Lived Intangible Assets, Net 2.5 15.7
Other 17.2 17.4
Other assets, net $ 97.8 $ 140.2