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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Supplemental Financial Information [Abstract]    
Deferred costs $ 38.9 $ 55.8
Deferred tax assets 67.5 94.8
Supplemental executive retirement plan assets 28.3 33.1
Prepaid taxes on intercompany transfers of property 33.4 37.1
Other 8.8 16.8
Other Assets, Net $ 176.9 $ 237.6