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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 182.8 $ 178.0
Deferred Tax Liabilities, Net, Noncurrent 62.7 18.5
Intangible Liabilities Noncurrent 54.3 59.6
Supplemental executive retirement plan liabilities 32.1 32.0
Deferred tax liabilities 24.8 18.1
Deferred revenue 13.4 51.2
Deferred Rent Credit, Noncurrent 12.1 17.1
Other 7.8 12.2
Other liabilities $ 390.0 $ 386.7