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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

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