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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 177.0 $ 178.0
Deferred Tax Liabilities, Net, Noncurrent 70.7 18.5
Intangible Liabilities Noncurrent 53.5 59.6
Supplemental executive retirement plan liabilities 28.1 32.0
Personnel costs 25.1 18.1
Deferred revenue 20.5 51.2
Deferred Rent Credit 11.7 17.1
Other Accrued Liabilities, Noncurrent 9.4 12.2
Other liabilities $ 396.0 $ 386.7