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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Deferred tax assets $ 15.5 $ 38.8
Intangible Assets, Net (Excluding Goodwill) 8.2 15.7
Deferred costs 24.8 37.4
Supplemental executive retirement plan assets 30.5 30.9
Other 14.9 17.4
Other assets, net $ 93.9 $ 140.2