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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Supplemental executive retirement plan liabilities $ 180.7 $ 178.0
Intangible Liabilities Noncurrent 55.1 59.6
Deferred revenue 23.2 51.2
Deferred Tax Liabilities, Net, Noncurrent 16.3 18.5
Supplemental executive retirement plan liabilities 31.5 32.0
Deferred tax liabilities 24.1 18.1
Deferred Rent Credit, Noncurrent 13.0 17.1
Other 18.1 12.2
Other liabilities $ 362.0 $ 386.7