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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 286.1 $ 323.1
Liability, Defined Benefit Plan, Noncurrent 296.6 246.7
Intangible Liabilities Noncurrent 50.4 52.1
Operating Lease, Liability, Noncurrent 21.6 51.8
Supplemental executive retirement plan liabilities 22.9 26.7
Personnel costs 11.8 24.5
Deferred revenue 14.3 9.7
Other Accrued Liabilities, Noncurrent 45.0 33.8
Other liabilities 762.4 867.4
Deferred Tax Liabilities, Net $ 13.7 $ 99.0