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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 144.2 $ 142.9
Deferred revenue 65.5 120.9
Supplemental executive retirement plan liabilities 31.2 28.9
Personnel costs 14.9 13.5
Other 23.4 16.3
Other liabilities $ 279.2 $ 322.5