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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]    
Deferred tax assets $ 63.5 $ 69.3
Deferred costs 30.8 35.7
Supplemental executive retirement plan assets 29.4 27.7
Prepaid taxes on intercompany transfers of property 0.0 33.0
Other 9.4 10.2
Other Assets, Net $ 133.1 $ 175.9